/// <summary>
/// Subscribe to value changes. Changing internal values for wrapped complex objects, won't trigger the callback.
/// The OnNext is also called imediately after you subscribe, to provide the current value.
/// </summary>
/// <param name="callback">The object that will listen for changes, implemeting IObserver<T></param>
/// <returns>A subscription reference</returns>
public IDisposable Subscribe(ValueProviderCallback <T> callback)
{
if (_callbacks.IndexOf(callback) >= 0)
{
throw new InvalidOperationException("Observer was already added to the observers list");
}
_callbacks.Add(callback);
callback.Invoke(this);
return(new Subscription <T>(_callbacks, callback));
}
public Subscription(List <ValueProviderCallback <T> > observers, ValueProviderCallback <T> observer)
{
_callbacks = observers;
_observer = observer;
}
/// <summary>
/// Unsubscribe the observer from further value changes.
/// </summary>
/// <param name="callback">The callback to be removed</param>
public void Unsubscribe(ValueProviderCallback <T> callback)
{
_callbacks.Remove(callback);
}
