private static void RegisterInstanceListener(int priority, EventComponent target, EventCallback callback)
{
SortedList <int, List <EventCallback> > instance;
// See if we we have any events registered to this target already
if (InstanceListeners.TryGetValue(target, out instance))
{
List <EventCallback> listeners;
// Check if there are any events registered to this priority already.
if (instance.TryGetValue(priority, out listeners))
{
listeners.Add(callback);
}
else
{
instance.Add(priority, new List <EventCallback> {
callback
});
}
}
else
{
// If there isn't. We need to create all the collections and add this to the instance listeners.
instance = new SortedList <int, List <EventCallback> > {
{ priority, new List <EventCallback> {
callback
} }
};
InstanceListeners.Add(target, instance);
}
}
private static void RemoveInstanceListener(int priority, EventComponent target, EventCallback callback)
{
SortedList <int, List <EventCallback> > instance;
// See if we we have any events registered to this target already
if (InstanceListeners.TryGetValue(target, out instance))
{
List <EventCallback> listeners;
if (instance.TryGetValue(priority, out listeners))
{
listeners.Remove(callback);
// Remove this priority if there are no more listeners
if (listeners == null || listeners.Count == 0)
{
GlobalListeners.RemoveAt(priority);
}
}
else
{
// Only log as a warning as this isn't technically an error, just something to keep an eye on as it shouldn't happen.
Debug.LogWarning($"Trying to remove a callback from priority {priority}, which does not exist for {GenericTypeName}.");
}
}
else
{
// Only log as a warning as this isn't technically an error, just something to keep an eye on as it shouldn't happen.
Debug.LogWarning($"Trying to remove a callback from the instance {target.name} but there are no listeners for it");
}
}
private static void CreateInstanceEvent(object sender, EventComponent target, T eventArgs)
{
SortedList <int, List <EventCallback> > instance;
// Check there are actually listeners registered for this target.
// It's okay if there are none. We just don't do anything
if (InstanceListeners.TryGetValue(target, out instance))
{
foreach (var listenerGroup in instance)
{
// Cache values so they don't create constant lookups
List <EventCallback> callbacks = listenerGroup.Value;
int callbackCount = callbacks.Count;
// For loop is slightly faster than foreach
for (int i = 0; i < callbackCount; i++)
{
callbacks[i]?.Invoke(eventArgs);
}
}
}
}