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);
    }

}