public static EarListener Start(Ear <TOutput> ear, INotifyPropertyChanged target, int index)
{
var listener = new EarListener(ear, index);
target.PropertyChanged += listener.TargetOnPropertyChanged;
return(listener);
}
private EarListener(Ear <TOutput> ear, int index)
{
this.ear = ear ?? throw new ArgumentNullException(nameof(ear));
if (index < 0 || index >= ear.path.Length)
{
throw new IndexOutOfRangeException(nameof(index));
}
this.index = index;
}
public static Ear <TOutput> Listen <TOutput>(this INotifyPropertyChanged target, params PropertyInfo[] path)
{
var ear = new Ear <TOutput>(target, path);
if (target is IDisposableHost host)
{
host.AddDisposable(ear);
}
return(ear);
}
public static void Then <T>(this Ear <T> ear, EarValueChangedHandler <T> handler)
{
// var semaphore = new Semaphore(1, 1);
var instrumentedHandler = new EarValueChangedHandler <T>((e, oldValue, newValue) =>
{
// if (semaphore.WaitOne())
// {
handler(e, oldValue, newValue);
// }
});
ear.ValueChanged += instrumentedHandler;
ear.AddDisposable(() => ear.ValueChanged -= handler);
}
public static void Then <T>(this Ear <T> ear, Action handler)
{
ear.Then((_, __, ___) => handler());
}