public ShellViewModel(IConverter converter)
{
this.BrowseCommand.Subscribe(() =>
{
var dialog = new Microsoft.Win32.OpenFileDialog()
{
Multiselect = false,
Filter = "Audio File|*.wav",
};
var result = dialog.ShowDialog(App.Current.MainWindow);
if (!result.HasValue || !result.Value)
{
return;
}
this.SourceFilePath.Value = dialog.FileName;
});
this.Progress = Observable.FromEventPattern <ProgressEventArgs>(h => converter.ProgressChanged += h, h => converter.ProgressChanged -= h)
.Select(x => x.EventArgs.Progress)
.DistinctUntilChanged()
.ObserveOnUIDispatcher()
.ToReadOnlyReactivePropertySlim();
this.ConvertCommand = new[]
{
this.SourceFilePath.Select(x => File.Exists(x)),
converter.ObserveProperty(x => x.Converting).Select(x => !x),
}
.CombineLatestValuesAreAllTrue()
.ObserveOnUIDispatcher()
.ToReactiveCommand()
.WithSubscribe(() =>
{
converter.BeginConversion(this.SourceFilePath.Value);
});
Observable.FromEventPattern <FaildEventArgs>(h => converter.Failed += h, h => converter.Failed -= h)
.ObserveOnUIDispatcher()
.Subscribe(x =>
{
var caption = "Error";
var message = x.EventArgs.Exception.Message;
System.Windows.MessageBox.Show(App.Current.MainWindow, message, caption);
});
}