LikeDislikeFormatter.php in Like/Dislike 8

Namespace

Drupal\like_dislike\Plugin\Field\FieldFormatter

File

src/Plugin/Field/FieldFormatter/LikeDislikeFormatter.php

<?php

namespace Drupal\like_dislike\Plugin\Field\FieldFormatter;

use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\FormatterBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Url;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Plugin implementation of the 'like_dislike_formatter' formatter.
 *
 * @FieldFormatter(
 *   id = "like_dislike_formatter",
 *   label = @Translation("Like Dislike"),
 *   field_types = {
 *     "like_dislike"
 *   }
 * )
 */
class LikeDislikeFormatter extends FormatterBase implements ContainerFactoryPluginInterface {

  /**
   * The current user.
   *
   * @var \Drupal\Core\Session\AccountInterface
   */
  protected $currentUser;

  /**
   * The request stack.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected $requestStack;

  /**
   * Constructs an ImageFormatter object.
   *
   * @param string $plugin_id
   *   The plugin_id for the formatter.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
   *   The definition of the field to which the formatter is associated.
   * @param array $settings
   *   The formatter settings.
   * @param string $label
   *   The formatter label display setting.
   * @param string $view_mode
   *   The view mode.
   * @param array $third_party_settings
   *   Any third party settings settings.
   * @param \Drupal\Core\Session\AccountInterface $current_user
   *   The current user.
   * @param \Symfony\Component\HttpFoundation\RequestStack $request
   *   The request stack.
   */
  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, $label, $view_mode, array $third_party_settings, AccountInterface $current_user, RequestStack $request) {
    parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $label, $view_mode, $third_party_settings);
    $this->currentUser = $current_user;
    $this->requestStack = $request;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($plugin_id, $plugin_definition, $configuration['field_definition'], $configuration['settings'], $configuration['label'], $configuration['view_mode'], $configuration['third_party_settings'], $container
      ->get('current_user'), $container
      ->get('request_stack'));
  }

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return array() + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    return array() + parent::settingsForm($form, $form_state);
  }

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

    // Implement settings summary.
    return $summary;
  }

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode = 'en') {
    $entity = $items
      ->getEntity();
    $elements = [];

    // Data to be passed in the url.
    $initial_data = [
      'entity_type' => $entity
        ->getEntityTypeId(),
      'entity_id' => $entity
        ->id(),
      'field_name' => $items
        ->getFieldDefinition()
        ->getName(),
    ];
    foreach ($items as $delta => $item) {
      $initial_data['likes'] = $items[$delta]->likes;
      $initial_data['dislikes'] = $items[$delta]->dislikes;
    }
    $data = base64_encode(json_encode($initial_data));
    $like_url = Url::fromRoute('like_dislike.manager', [
      'clicked' => 'like',
      'data' => $data,
    ])
      ->toString();
    $dislike_url = Url::fromRoute('like_dislike.manager', [
      'clicked' => 'dislike',
      'data' => $data,
    ])
      ->toString();

    // If user is anonymous, then append the destination back url.
    $user = $this->currentUser
      ->id();
    $destination = '';
    if ($user == 0) {
      $destination = '?like-dislike-redirect=' . $this->requestStack
        ->getCurrentRequest()
        ->getUri();
    }
    $elements[] = [
      '#theme' => 'like_dislike',
      '#likes' => $initial_data['likes'],
      '#dislikes' => $initial_data['dislikes'],
      '#like_url' => $like_url . $destination,
      '#dislike_url' => $dislike_url . $destination,
      '#entity_id' => $initial_data['entity_id'],
    ];
    $elements['#attached']['library'][] = 'core/drupal.ajax';
    $elements['#attached']['library'][] = 'like_dislike/like_dislike';

    // Set the cache for the element.
    $elements['#cache']['max-age'] = 0;
    return $elements;
  }

}

Classes

Name	Description
LikeDislikeFormatter	Plugin implementation of the 'like_dislike_formatter' formatter.