HistoryUserTimestamp.php

<?php

namespace Drupal\history\Plugin\views\field;

use Drupal\Core\Form\FormStateInterface;
use Drupal\views\ResultRow;
use Drupal\views\ViewExecutable;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\node\Plugin\views\field\Node;

/**
 * Field handler to display the marker for new content.
 *
 * The handler is named history_user, because of compatibility reasons, the
 * table is history.
 *
 * @ingroup views_field_handlers
 *
 * @ViewsField("history_user_timestamp")
 */
class HistoryUserTimestamp extends Node {
    
    /**
     * {@inheritdoc}
     */
    public function usesGroupBy() {
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
        parent::init($view, $display, $options);
        if (\Drupal::currentUser()->isAuthenticated()) {
            $this->additional_fields['created'] = [
                'table' => 'node_field_data',
                'field' => 'created',
            ];
            $this->additional_fields['changed'] = [
                'table' => 'node_field_data',
                'field' => 'changed',
            ];
            if (\Drupal::moduleHandler()->moduleExists('comment') && !empty($this->options['comments'])) {
                $this->additional_fields['last_comment'] = [
                    'table' => 'comment_entity_statistics',
                    'field' => 'last_comment_timestamp',
                ];
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['comments'] = [
            'default' => FALSE,
        ];
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildOptionsForm(&$form, FormStateInterface $form_state) {
        parent::buildOptionsForm($form, $form_state);
        if (\Drupal::moduleHandler()->moduleExists('comment')) {
            $form['comments'] = [
                '#type' => 'checkbox',
                '#title' => $this->t('Check for new comments as well'),
                '#default_value' => !empty($this->options['comments']),
            ];
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        // Only add ourselves to the query if logged in.
        if (\Drupal::currentUser()->isAnonymous()) {
            return;
        }
        parent::query();
    }
    
    /**
     * {@inheritdoc}
     */
    public function render(ResultRow $values) {
        // Let's default to 'read' state.
        // This code shadows node_mark, but it reads from the db directly and
        // we already have that info.
        $mark = MARK_READ;
        if (\Drupal::currentUser()->isAuthenticated()) {
            $last_read = $this->getValue($values);
            $changed = $this->getValue($values, 'changed');
            $last_comment = \Drupal::moduleHandler()->moduleExists('comment') && !empty($this->options['comments']) ? $this->getValue($values, 'last_comment') : 0;
            if (!$last_read && $changed > HISTORY_READ_LIMIT) {
                $mark = MARK_NEW;
            }
            elseif ($changed > $last_read && $changed > HISTORY_READ_LIMIT) {
                $mark = MARK_UPDATED;
            }
            elseif ($last_comment > $last_read && $last_comment > HISTORY_READ_LIMIT) {
                $mark = MARK_UPDATED;
            }
            $build = [
                '#theme' => 'mark',
                '#status' => $mark,
            ];
            return $this->renderLink(\Drupal::service('renderer')->render($build), $values);
        }
    }

}