public IObservable <InputAction.CallbackContext> PerformedAsObservable(int priority = 0)
{
void OnRemoveSubscriber(Action <InputAction.CallbackContext> onNext)
{
InputActionSubscriber subscriber = performedSubscribers
.FirstOrDefault(it => it.Priority == priority && it.OnNext == onNext);
performedSubscribers.Remove(subscriber);
// No subscriber left in event queue. Thus, remove the callback from the InputAction.
if (performedSubscribers.Count == 0)
{
InputAction.performed -= NotifyPerformedSubscribers;
performedSubscribers = null;
}
}
void OnAddSubscriber(Action <InputAction.CallbackContext> onNext)
{
// Add the one callback that will update all subscribers
if (performedSubscribers == null)
{
performedSubscribers = new List <InputActionSubscriber>();
InputAction.performed += NotifyPerformedSubscribers;
Owner.OnDestroyAsObservable().Subscribe(_ => InputAction.performed -= NotifyPerformedSubscribers);
}
performedSubscribers.Add(new InputActionSubscriber(priority, onNext));
performedSubscribers.Sort(CompareByPriority);
}
return(Observable.FromEvent <InputAction.CallbackContext>(OnAddSubscriber, OnRemoveSubscriber));
}
private void NotifyCanceledSubscribers(InputAction.CallbackContext callbackContext)
{
// Iteration over index to enable removing subscribers as part of the callback (i.e., during iteration).
for (int i = 0; canceledSubscribers != null && i < canceledSubscribers.Count; i++)
{
if (notifyCancelledInFrame != Time.frameCount)
{
InputActionSubscriber subscriber = canceledSubscribers[i];
subscriber.OnNext.Invoke(callbackContext);
}
else
{
return;
}
}
}
private int CompareByPriority(InputActionSubscriber a, InputActionSubscriber b)
{
// Sort descending: compare b to a
return(b.Priority.CompareTo(a.Priority));
}
