/// <summary>Adds the new target.</summary>
/// <remarks>Precondition: target is null, newTarget is non-null.</remarks>
/// <param name="newTarget">The new target.</param>
private void AddTarget(Thing newTarget)
{
var self = Parent;
if (self != null)
{
var message = CreateFollowMessage(self, newTarget);
var followEvent = new FollowEvent(self, message, self, newTarget);
self.Eventing.OnMovementRequest(followEvent, EventScope.ParentsDown);
if (!followEvent.IsCancelled)
{
target = new SimpleWeakReference <Thing>(newTarget);
newTarget.Eventing.MovementEvent += ProcessMovementEvent;
self.Eventing.OnMovementEvent(followEvent, EventScope.ParentsDown);
}
}
}