public CFNotificationObserverToken AddObserver(string name, INativeObject objectToObserve, Action <string, NSDictionary?> notificationHandler,
CFNotificationSuspensionBehavior suspensionBehavior = CFNotificationSuspensionBehavior.DeliverImmediately)
{
if (darwinnc is not null && darwinnc.Handle == Handle)
{
if (name is null)
{
throw new ArgumentNullException(nameof(name), "When using the Darwin Notification Center, the value passed must not be null");
}
}
var strHandle = CFString.CreateNative(name);
name = name ?? NullNotificationName;
var token = new CFNotificationObserverToken(name)
{
centerHandle = Handle,
nameHandle = strHandle,
observedObject = objectToObserve.GetHandle(),
listener = notificationHandler
};
//
// To allow callbacks to add observers, we duplicate the list of listeners on AddObserver
// We do the duplication on AddObserver, instead of making a copy on the notification
// callback, as we expect the notification callback to be a more common operation
// than the AddObserver operation
//
List <CFNotificationObserverToken>?listenersForName;
lock (listeners){
if (!listeners.TryGetValue(name, out listenersForName))
{
listenersForName = new List <CFNotificationObserverToken> (1);
CFNotificationCenterAddObserver(center: Handle,
observer: Handle,
callback: NotificationCallback,
name: strHandle,
obj: token.observedObject,
suspensionBehavior: (IntPtr)suspensionBehavior);
}
else
{
listenersForName = new List <CFNotificationObserverToken> (listenersForName);
}
listenersForName.Add(token);
listeners [name] = listenersForName;
}
return(token);
}
public Error PlayerPrefetch(ITrack track)
{
AssertHandle();
INativeObject nativeObject = track as INativeObject;
if (nativeObject == null)
{
throw new ArgumentException("Invalid argument");
}
lock (Spotify.Mutex)
{
return(Spotify.sp_session_player_prefetch(Handle, nativeObject.GetHandle()));
}
}