[TArray](API\Runtime\Core\Containers\TArray)< [FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) > GetKeysByPredicate ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool(const [FRigBaseElement](API\Plugins\ControlRig\Rigs\FRigBaseElement) &)> InPredicateFunc, bool bInTraverse ) const