class EntityViewDisplayEditForm

class EntityViewDisplayEditForm extends EntityDisplayFormBase {
  
  /**
   * {@inheritdoc}
   */
  protected $displayContext = 'view';
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('plugin.manager.field.field_type'), $container->get('plugin.manager.field.formatter'), $container->get('entity_display.repository'), $container->get('entity_field.manager'));
  }
  
  /**
   * {@inheritdoc}
   */
  protected function buildFieldRow(FieldDefinitionInterface $field_definition, array $form, FormStateInterface $form_state) {
    $field_row = parent::buildFieldRow($field_definition, $form, $form_state);
    $field_name = $field_definition->getName();
    $display_options = $this->entity
      ->getComponent($field_name);
    // Insert the label column.
    $label = [
      'label' => [
        '#type' => 'select',
        '#title' => $this->t('Label display for @title', [
          '@title' => $field_definition->getLabel(),
        ]),
        '#title_display' => 'invisible',
        '#options' => $this->getFieldLabelOptions(),
        '#default_value' => $display_options ? $display_options['label'] : 'above',
      ],
    ];
    $label_position = array_search('plugin', array_keys($field_row));
    $field_row = array_slice($field_row, 0, $label_position, TRUE) + $label + array_slice($field_row, $label_position, count($field_row) - 1, TRUE);
    // Update the (invisible) title of the 'plugin' column.
    $field_row['plugin']['#title'] = $this->t('Formatter for @title', [
      '@title' => $field_definition->getLabel(),
    ]);
    if (!empty($field_row['plugin']['settings_edit_form']) && $plugin = $this->entity
      ->getRenderer($field_name)) {
      $plugin_type_info = $plugin->getPluginDefinition();
      $field_row['plugin']['settings_edit_form']['label']['#markup'] = $this->t('Format settings:') . ' <span class="plugin-name">' . $plugin_type_info['label'] . '</span>';
    }
    return $field_row;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function buildExtraFieldRow($field_id, $extra_field) {
    $extra_field_row = parent::buildExtraFieldRow($field_id, $extra_field);
    // Insert an empty placeholder for the label column.
    $label = [
      'empty_cell' => [
        '#markup' => '&nbsp;',
      ],
    ];
    $label_position = array_search('plugin', array_keys($extra_field_row));
    $extra_field_row = array_slice($extra_field_row, 0, $label_position, TRUE) + $label + array_slice($extra_field_row, $label_position, count($extra_field_row) - 1, TRUE);
    return $extra_field_row;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getEntityDisplay($entity_type_id, $bundle, $mode) {
    return $this->entityDisplayRepository
      ->getViewDisplay($entity_type_id, $bundle, $mode);
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getDefaultPlugin($field_type) {
    return isset($this->fieldTypes[$field_type]['default_formatter']) ? $this->fieldTypes[$field_type]['default_formatter'] : NULL;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getDisplayModes() {
    return $this->entityDisplayRepository
      ->getViewModes($this->entity
      ->getTargetEntityTypeId());
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getDisplayModeOptions() {
    return $this->entityDisplayRepository
      ->getViewModeOptions($this->entity
      ->getTargetEntityTypeId());
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getDisplayModesLink() {
    return [
      '#type' => 'link',
      '#title' => t('Manage view modes'),
      '#url' => Url::fromRoute('entity.entity_view_mode.collection'),
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getTableHeader() {
    return [
      $this->t('Field'),
      $this->t('Weight'),
      $this->t('Parent'),
      $this->t('Region'),
      $this->t('Label'),
      [
        'data' => $this->t('Format'),
        'colspan' => 3,
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getOverviewUrl($mode) {
    $entity_type = $this->entityTypeManager
      ->getDefinition($this->entity
      ->getTargetEntityTypeId());
    return Url::fromRoute('entity.entity_view_display.' . $this->entity
      ->getTargetEntityTypeId() . '.view_mode', [
      'view_mode_name' => $mode,
    ] + FieldUI::getRouteBundleParameter($entity_type, $this->entity
      ->getTargetBundle()));
  }
  
  /**
   * Returns an array of visibility options for field labels.
   *
   * @return array
   *   An array of visibility options.
   */
  protected function getFieldLabelOptions() {
    return [
      'above' => $this->t('Above'),
      'inline' => $this->t('Inline'),
      'hidden' => '- ' . $this->t('Hidden') . ' -',
      'visually_hidden' => '- ' . $this->t('Visually Hidden') . ' -',
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  protected function thirdPartySettingsForm(PluginSettingsInterface $plugin, FieldDefinitionInterface $field_definition, array $form, FormStateInterface $form_state) {
    $settings_form = [];
    // Invoke hook_field_formatter_third_party_settings_form(), keying resulting
    // subforms by module name.
    foreach ($this->moduleHandler
      ->getImplementations('field_formatter_third_party_settings_form') as $module) {
      $settings_form[$module] = $this->moduleHandler
        ->invoke($module, 'field_formatter_third_party_settings_form', [
        $plugin,
        $field_definition,
        $this->entity
          ->getMode(),
        $form,
        $form_state,
      ]);
    }
    return $settings_form;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function alterSettingsSummary(array &$summary, PluginSettingsInterface $plugin, FieldDefinitionInterface $field_definition) {
    $context = [
      'formatter' => $plugin,
      'field_definition' => $field_definition,
      'view_mode' => $this->entity
        ->getMode(),
    ];
    $this->moduleHandler
      ->alter('field_formatter_settings_summary', $summary, $context);
  }

}