questionnaires-8.x-1.x-dev/src/Plugin/Field/FieldWidget/MultiChoiceWidget.php

<?php

namespace Drupal\questionnaires\Plugin\Field\FieldWidget;

use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\Validator\ConstraintViolationInterface;

/**
 * Plugin implementation of the 'multi_choice_widget' widget.
 *
 * @FieldWidget(
 *   id = "multi_choice_widget",
 *   module = "questionnaires",
 *   label = @Translation("Multi choice widget"),
 *   field_types = {
 *     "multi_choice_field"
 *   }
 * )
 */
class MultiChoiceWidget extends WidgetBase {

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return [
      'rows' => '5',
      'placeholder' => '',
    ] + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $elements = [];

    $elements['rows'] = array(
      '#type' => 'number',
      '#title' => t('Rows'),
      '#default_value' => $this->getSetting('rows'),
      '#required' => TRUE,
      '#min' => 1,
    );
    $elements['placeholder'] = array(
      '#type' => 'textfield',
      '#title' => t('Placeholder'),
      '#default_value' => $this->getSetting('placeholder'),
      '#description' => t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
    );

    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = [];

    $summary[] = t('Number of rows: @rows', array(
      '@rows' => $this->getSetting('rows'),
    ));
    $placeholder = $this->getSetting('placeholder');
    if (!empty($placeholder)) {
      $summary[] = t('Placeholder: @placeholder', array(
        '@placeholder' => $placeholder,
      ));
    }

    return $summary;
  }

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element = $element + array(
      '#type' => 'text_format',
      '#base_type' => 'textarea',
      '#format' => $items[$delta]->format,
      '#default_value' => $items[$delta]->value,
      '#rows' => $this->getSetting('rows'),
      '#placeholder' => $this->getSetting('placeholder'),
      '#attributes' => array(
        'class' => array(
          'js-text-full',
          'text-full',
        ),
      ),
    );
    $element['correct_answer'] = array(
      '#type' => 'checkbox',
      '#default_value' => !empty($items[$delta]->correct_answer),
      '#title' => t('Correct answer'),
    );

    return $element;
  }

  /**
   * {@inheritdoc}
   */
  public function errorElement(array $element, ConstraintViolationInterface $violation, array $form, FormStateInterface $form_state) {
    if ($violation->arrayPropertyPath == array(
      'format',
    ) && isset($element['format']['#access']) && !$element['format']['#access']) {
      return FALSE;
    }
    return $element;
  }
}