private static void BindOrUnbindCallback(this AnimationClip clip, GameObject animEvtReceiverObject, float atPosition, Action callback, bool bind)
{
var actionWord = bind ? "register" : "unregister";
if (animEvtReceiverObject == null)
{
Debug.LogWarningFormat("Trying to {0} callback for null animation event receiver game object", actionWord);
return;
}
if (callback == null)
{
Debug.LogWarningFormat("Trying to {0} null callback for animation clip", actionWord);
return;
}
if (atPosition < 0.0f || atPosition > clip.length)
{
Debug.LogWarningFormat("Trying to {0} callback for position outside of clip timeline", actionWord);
return;
}
var eventReceiver = animEvtReceiverObject.GetComponent <AnimationEventReceiver>();
if (bind)
{
if (eventReceiver == null)
{
eventReceiver = animEvtReceiverObject.AddComponent <AnimationEventReceiver>();
}
// Use callback timeline position as unique identifier of the list of callbacks
// called at that timeline position. Set timeline position as animation event parameter
// to send it to AnimationEventReceiver to get list of callbacks at that position.
eventReceiver.RegisterTimelineCallback(atPosition, callback);
clip.AddEventIfNotExists(OnTimelineEventRaisedMethodName, atPosition, atPosition);
}
else
{
if (eventReceiver == null)
{
Debug.LogWarningFormat("Trying to unregister callback for game object without AnimationEventReceiver component");
return;
}
// Currently AnimationEventReceiver component is not removed when all callback for all positions
// are removed. This is due to component being public which means it could be used by user code.
var lastCallbackForPositionRemoved = eventReceiver.UnregisterTimelineCallback(atPosition, callback);
if (lastCallbackForPositionRemoved)
{
clip.RemoveEvent(OnTimelineEventRaisedMethodName, atPosition, atPosition);
}
}
}
