Provide a form for setting options.
Overrides RowPluginBase::buildOptionsForm
public function buildOptionsForm(&$form, &$form_state) {
parent::buildOptionsForm($form, $form_state);
$initial_labels = array(
'' => t('- None -'),
);
$view_fields_labels = $this->displayHandler
->getFieldLabels();
$view_fields_labels = array_merge($initial_labels, $view_fields_labels);
$form['title_field'] = array(
'#type' => 'select',
'#title' => t('Title field'),
'#description' => t('The field that is going to be used as the RSS item title for each row.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['title_field'],
'#required' => TRUE,
);
$form['link_field'] = array(
'#type' => 'select',
'#title' => t('Link field'),
'#description' => t('The field that is going to be used as the RSS item link for each row. This must be a drupal relative path.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['link_field'],
'#required' => TRUE,
);
$form['description_field'] = array(
'#type' => 'select',
'#title' => t('Description field'),
'#description' => t('The field that is going to be used as the RSS item description for each row.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['description_field'],
'#required' => TRUE,
);
$form['creator_field'] = array(
'#type' => 'select',
'#title' => t('Creator field'),
'#description' => t('The field that is going to be used as the RSS item creator for each row.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['creator_field'],
'#required' => TRUE,
);
$form['date_field'] = array(
'#type' => 'select',
'#title' => t('Publication date field'),
'#description' => t('The field that is going to be used as the RSS item pubDate for each row. It needs to be in RFC 2822 format.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['date_field'],
'#required' => TRUE,
);
$form['guid_field_options'] = array(
'#type' => 'details',
'#title' => t('GUID settings'),
'#collapsible' => FALSE,
'#collapsed' => FALSE,
);
$form['guid_field_options']['guid_field'] = array(
'#type' => 'select',
'#title' => t('GUID field'),
'#description' => t('The globally unique identifier of the RSS item.'),
'#options' => $view_fields_labels,
'#default_value' => $this->options['guid_field_options']['guid_field'],
'#required' => TRUE,
);
$form['guid_field_options']['guid_field_is_permalink'] = array(
'#type' => 'checkbox',
'#title' => t('GUID is permalink'),
'#description' => t('The RSS item GUID is a permalink.'),
'#default_value' => $this->options['guid_field_options']['guid_field_is_permalink'],
);
}