protected function getValue(DatasourceInterface $datasource, FieldDefinition $fieldDescription, $rendererPrefix = null)
{
$fieldTypeName = $fieldDescription->getFieldType();
$fieldTypeInstance = $this->configuration->getFieldTypeInstance($fieldTypeName, $rendererPrefix);
$unformattedFieldValue = $datasource->getFieldValue($fieldDescription);
$formattedFieldValue = $fieldTypeInstance->render($unformattedFieldValue);
if (null !== $fieldDescription->getCallback()) {
$formattedFieldValue = $fieldDescription->executeCallBack($formattedFieldValue, $datasource);
}
return $formattedFieldValue;
}
public function executeCallback($value, DatasourceInterface $datasource)
{
$callback = $this->callback;
if (!$callback instanceof Closure) {
throw new InvalidArgumentException('The callback must be a callable');
}
return $callback($value, $datasource->current());
}