DateFormatEditForm.php

<?php

namespace Drupal\system\Form;

use Drupal\Component\Datetime\TimeInterface;
use Drupal\Core\Config\Entity\ConfigEntityStorageInterface;
use Drupal\Core\Datetime\DateFormatterInterface;
use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a form for editing a date format.
 *
 * @internal
 */
class DateFormatEditForm extends DateFormatFormBase {
    
    /**
     * Constructs a DateFormatEditForm object.
     *
     * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
     *   The date service.
     * @param \Drupal\Core\Config\Entity\ConfigEntityStorageInterface $date_format_storage
     *   The date format storage.
     * @param \Drupal\Component\Datetime\TimeInterface $time
     *   The time service.
     */
    public function __construct(DateFormatterInterface $date_formatter, ConfigEntityStorageInterface $date_format_storage, TimeInterface $time) {
        parent::__construct($date_formatter, $date_format_storage);
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('date.formatter'), $container->get('entity_type.manager')
            ->getStorage('date_format'), $container->get('datetime.time'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function form(array $form, FormStateInterface $form_state) {
        $form = parent::form($form, $form_state);
        $now = t('Displayed as %date', [
            '%date' => $this->dateFormatter
                ->format($this->time
                ->getRequestTime(), $this->entity
                ->id()),
        ]);
        $form['date_format_pattern']['#field_suffix'] = ' <small data-drupal-date-formatter="preview">' . $now . '</small>';
        $form['date_format_pattern']['#default_value'] = $this->entity
            ->getPattern();
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function actions(array $form, FormStateInterface $form_state) {
        $actions = parent::actions($form, $form_state);
        $actions['submit']['#value'] = $this->t('Save format');
        unset($actions['delete']);
        return $actions;
    }

}