ContextDelete.php

<?php

namespace Drupal\ctools\Form;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Form\ConfirmFormBase;
use Drupal\Core\TempStore\SharedTempStoreFactory;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a form for deleting an contexts and relationships.
 */
abstract class ContextDelete extends ConfirmFormBase {
    
    /**
     * @var \Drupal\Core\TempStore\SharedTempStoreFactory
     */
    protected $tempstore;
    
    /**
     * @var string
     */
    protected $tempstore_id;
    
    /**
     * @var string
     */
    protected $machine_name;
    
    /**
     * The static context's machine name.
     *
     * @var array
     */
    protected $context_id;
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('tempstore.shared'));
    }
    
    /**
     * Context Delete Constructor.
     *
     * @param \Drupal\Core\TempStore\SharedTempStoreFactory $tempstore
     *   Tempstore Service.
     */
    public function __construct(SharedTempStoreFactory $tempstore) {
        $this->tempstore = $tempstore;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'ctools_context_delete_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Delete');
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state, $tempstore_id = NULL, $machine_name = NULL, $context_id = NULL) {
        $this->tempstore_id = $tempstore_id;
        $this->machine_name = $machine_name;
        $this->context_id = $context_id;
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $form_state->setRedirectUrl($this->getCancelUrl());
    }
    
    /**
     * Get a temp storage object.
     *
     * @return mixed
     *   The tempstore object.
     */
    protected function getTempstore() {
        return $this->tempstore
            ->get($this->tempstore_id)
            ->get($this->machine_name);
    }
    
    /**
     * Set the temp storage.
     *
     * @param array $cached_values
     *   Cached values to use in the tempstore.
     *
     * @throws \Drupal\Core\TempStore\TempStoreException
     */
    protected function setTempstore($cached_values) {
        $this->tempstore
            ->get($this->tempstore_id)
            ->set($this->machine_name, $cached_values);
    }

}