LayoutSectionItem.php

<?php

namespace Drupal\layout_builder\Plugin\Field\FieldType;

use Drupal\Core\Field\Attribute\FieldType;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemBase;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\TypedData\DataDefinition;
use Drupal\layout_builder\Field\LayoutSectionItemList;
use Drupal\layout_builder\Section;

/**
 * Plugin implementation of the 'layout_section' field type.
 *
 * @internal
 *   Plugin classes are internal.
 *
 * @property \Drupal\layout_builder\Section $section
 */
class LayoutSectionItem extends FieldItemBase {
    
    /**
     * {@inheritdoc}
     */
    public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
        $properties['section'] = DataDefinition::create('layout_section')->setLabel(new TranslatableMarkup('Layout Section'))
            ->setRequired(FALSE);
        return $properties;
    }
    
    /**
     * {@inheritdoc}
     */
    public function __get($name) {
        // @todo \Drupal\Core\Field\FieldItemBase::__get() does not return default
        //   values for un-instantiated properties. This will forcibly instantiate
        //   all properties with the side-effect of a performance hit, resolve
        //   properly in https://www.drupal.org/node/2413471.
        $this->getProperties();
        return parent::__get($name);
    }
    
    /**
     * {@inheritdoc}
     */
    public static function mainPropertyName() {
        return 'section';
    }
    
    /**
     * {@inheritdoc}
     */
    public static function schema(FieldStorageDefinitionInterface $field_definition) {
        $schema = [
            'columns' => [
                'section' => [
                    'type' => 'blob',
                    'size' => 'normal',
                    'serialize' => TRUE,
                ],
            ],
        ];
        return $schema;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
        // @todo Expand this in https://www.drupal.org/node/2912331.
        $values['section'] = new Section('layout_onecol');
        return $values;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isEmpty() {
        return empty($this->section);
    }

}