ListWidget.php in Select (or other) 8

Namespace

Drupal\select_or_other\Plugin\Field\FieldWidget

File

src/Plugin/Field/FieldWidget/ListWidget.php

<?php

namespace Drupal\select_or_other\Plugin\Field\FieldWidget;

use Drupal\Core\Entity\FieldableEntityInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Form\FormStateInterface;

/**
 * Plugin implementation of the 'select_or_other_list' widget.
 *
 * @FieldWidget(
 *   id = "select_or_other_list",
 *   label = @Translation("Select or Other"),
 *   field_types = {
 *     "list_integer",
 *     "list_float",
 *     "list_string"
 *   },
 *   multiple_values = TRUE
 * )
 */
class ListWidget extends WidgetBase {

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return [
      'add_other_value_to_allowed_values' => TRUE,
    ] + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $form = parent::settingsForm($form, $form_state);
    $form['add_other_value_to_allowed_values'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Add entered values from the other field to the allowed values list.'),
      '#default_value' => $this
        ->getSetting('add_other_value_to_allowed_values'),
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  protected function getOptions(FieldableEntityInterface $entity = NULL) {
    $options = [];
    if ($entity) {
      $options = $this->fieldDefinition
        ->getFieldStorageDefinition()
        ->getOptionsProvider($this
        ->getColumn(), $entity)
        ->getSettableOptions(\Drupal::currentUser());
    }
    return $options;
  }

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element = parent::formElement($items, $delta, $element, $form, $form_state);
    if (!$this
      ->getSetting('add_other_value_to_allowed_values')) {

      // Add original options to the element.
      $element['#original_options'] = $element['#options'];

      // Add selected "Other" values to the element.
      $element['#other_options'] = [];
      $values = $items
        ->getValue();
      if (!empty($values)) {
        foreach ($values as $value) {

          // Set value only if value exists and is not a default option.
          if (isset($value['value']) && !isset($element['#options'][$value['value']])) {
            $element['#other_options'][] = $value['value'];
          }
        }
      }
    }
    $element = $element + [
      '#merged_values' => TRUE,
    ];
    return $element;
  }
  public function massageFormValues(array $values, array $form, FormStateInterface $form_state) {
    unset($values['select']);
    unset($values['other']);
    if ($this
      ->getSetting('add_other_value_to_allowed_values')) {
      $new_values = $this
        ->extractNewValues($values);
      if (!empty($new_values)) {
        $this
          ->addNewValuesToAllowedValues($new_values);
      }
    }
    return parent::massageFormValues($values, $form, $form_state);
  }

  /**
   * Extract unknown values found in the values array.
   *
   * @param array $values
   *   The values.
   *
   * @return array
   *   Any unknown values found in the values array.
   */
  protected function extractNewValues(array $values) {
    $allowed_values = $this->fieldDefinition
      ->getSetting('allowed_values');
    $new_values = [];
    foreach ($values as $value) {
      if (!empty($value) && !isset($allowed_values[$value])) {
        $new_values[] = $value;
      }
    }
    return $new_values;
  }

  /**
   * Adds new values to the allowed values for this field.
   *
   * @param array $values_to_add
   *   The values to add to the allowed values.
   */
  protected function addNewValuesToAllowedValues(array $values_to_add) {
    $entity_type = $this->fieldDefinition
      ->getTargetEntityTypeId();
    $field_name = $this->fieldDefinition
      ->getName();

    /** @var \Drupal\field\FieldStorageConfigInterface $storage */
    $storage = \Drupal::entityTypeManager()
      ->getStorage('field_storage_config')
      ->load("{$entity_type}.{$field_name}");
    $allowed_values = $storage
      ->getSetting('allowed_values');
    foreach ($values_to_add as $value) {
      if (!isset($allowed_values[$value])) {
        $allowed_values[$value] = $value;
      }
    }
    if ($allowed_values !== $storage
      ->getSetting('allowed_values')) {
      $storage
        ->setSetting('allowed_values', $allowed_values)
        ->save();
      drupal_static_reset('options_allowed_values');
    }
  }

}

Classes

Name	Description
ListWidget	Plugin implementation of the 'select_or_other_list' widget.