Return TRUE if this style also uses fields.
bool
function usesFields() {
// If we use a row plugin, ask the row plugin. Chances are, we don't
// care, it does.
$row_uses_fields = FALSE;
if ($this
->usesRowPlugin() && !empty($this->view->rowPlugin)) {
$row_uses_fields = $this->view->rowPlugin
->usesFields();
}
// Otherwise, check the definition or the option.
return $row_uses_fields || $this->usesFields || !empty($this->options['uses_fields']);
}