materio-d8/modules/custom/materio_samples/src/Plugin/Field/FieldType/SamplesItem.php

<?php

namespace Drupal\materio_samples\Plugin\Field\FieldType;

use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\TypedData\DataDefinition;
use Drupal\Core\TypedData\DataReferenceTargetDefinition;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Plugin implementation of the 'field_example_rgb' field type.
 *
 * @FieldType(
 *   id = "materio_samples_field",
 *   label = @Translation("Samples"),
 *   module = "materio_samples",
 *   category = "Materio",
 *   description = @Translation("Provide a sample field, each showroom (taxonomy term) can fill it's own sample reference, and only it's own."),
 *   default_widget = "materio_samples_default_widget",
 *   default_formatter = "materio_samples_default_formatter"
 * )
 */
class SamplesItem extends FieldItemBase {

  /**
   * {@inheritdoc}
   */
  public static function schema(FieldStorageDefinitionInterface $field_definition) {
    return [
      'columns' => [
        'location' => [
          'description' => "The actual location reference in the showroom.",
          'type' => 'text',
          'size' => 'tiny',
          // 'not null' => FALSE,
        ],
        'target_id' => [
          'description' => 'the id of the target taxonomy term.',
          'type' => 'int',
          'unsigned' => TRUE
        ]
      ],
      'indexes' => [
        'target_id' => ['target_id'],
      ],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function isEmpty() {
    $value = $this->get('location')->getValue();
    return $value === NULL || $value === '';
  }

  /**
   * {@inheritdoc}
   */
  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
    $properties['location'] = DataDefinition::create('string')
      ->setLabel(t('Reference'));

    $properties['target_id'] = DataReferenceTargetDefinition::create('integer')
        // ->setLabel(new TranslatableMarkup('@label ID', ['@label' => $target_type_info->getLabel()]))
        ->setLabel(new TranslatableMarkup('@label ID', ['@label' => 'Showroom'])) // get voc name from settings
        ->setSetting('unsigned', TRUE)
        ->setRequired(TRUE);

    return $properties;
  }

  /**
   * {@inheritdoc}
   */
  public static function defaultFieldSettings() {
    return [
      // Declare a single setting, 'size', with a default
      // value of 'large'
      'vid' => null,
    ] + parent::defaultFieldSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
    // dsm($form);

    // get vocabularies
    $vocabularies = \Drupal\taxonomy\Entity\Vocabulary::loadMultiple();
    // dsm($vocabularies);
    $options = [null => "choose"];
    foreach ($vocabularies as $vid => $voc) {
      $options[$voc->id()] = $voc->label();
    }
    // dsm($options);

    $element = [];
    // The key of the element should be the setting name
    $element['vid'] = [
      '#title' => $this->t('Vocabulary'),
      '#type' => 'select',
      '#options' => $options,
      '#default_value' => $this->getSetting('vid'),
    ];

    return $element;
  }

  /**
   * Form element validation handler; Invokes selection plugin's validation.
   *
   * @param array $form
   *   The form where the settings form is being included in.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The form state of the (entire) configuration form.
   */
  public static function fieldSettingsFormValidate(array $form, FormStateInterface $form_state) {
    $field = $form_state->getFormObject()->getEntity();
    dsm($field);
  }
}