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   1 /**
   2  * Implements hook_field_formatter_settings_form().
   3  */
   4 function {{ machine_name }}_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state) {
   5   $display = $instance['display'][$view_mode];
   6   $settings = $display['settings'];
   7
   8   $element = array();
   9
  10   if ($display['type'] == 'text_trimmed' || $display['type'] == 'text_summary_or_trimmed') {
  11     $element['trim_length'] = array(
  12       '#title' => t('Length'),
  13       '#type' => 'textfield',
  14       '#size' => 20,
  15       '#default_value' => $settings['trim_length'],
  16       '#element_validate' => array('element_validate_integer_positive'),
  17       '#required' => TRUE,
  18     );
  19   }
  20
  21   return $element;
  22
  23 }