Default options form that provides the label widget that all fields should have.
Overrides FieldPluginBase::buildOptionsForm
public function buildOptionsForm(&$form, &$form_state) {
foreach ($this->formats as $key => $item) {
$options[$key] = implode('/', $item);
}
$form['type'] = array(
'#type' => 'select',
'#title' => t('Output format'),
'#options' => $options,
'#default_value' => $this->options['type'],
);
$form['not'] = array(
'#type' => 'checkbox',
'#title' => t('Reverse'),
'#description' => t('If checked, true will be displayed as false.'),
'#default_value' => $this->options['not'],
);
parent::buildOptionsForm($form, $form_state);
}