public static IObservable <T> AsObservable <T>(this INotifyDisposable disposable, Func <T> lastValue = null)
{
return(Observable.Create <T>(observer =>
{
if (disposable.IsDisposed)
{
if (lastValue != null)
{
observer.OnNext(lastValue());
}
observer.OnCompleted();
return Disposables.Empty;
}
var handler = Disposables.Call(() =>
{
if (lastValue != null)
{
observer.OnNext(lastValue());
}
observer.OnCompleted();
});
disposable.Attach(handler, keepAlive: true);
return Disposables.Call(() =>
{
disposable.Dettach(handler);
});
}));
}
public static INotifyDisposable WhenDisposed(this INotifyDisposable source, Action action)
{
var call = Disposables.Call(action);
source.Attach(call, keepAlive: true);
return(source);
}
public static T DisposedBy <T>(this T child, INotifyDisposable disposer)
where T : IDisposable
{
if (child is Task)
{
throw new ArgumentException("Can not register Task for late disposal", nameof(child));
}
disposer.Attach(child);
return(child);
}
public void Attach(IDisposable child, bool keepAlive = false) => _handler.Attach(child, keepAlive);