--- /dev/null
+<?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'];
+ }
+ }
+ }
+
+ protected function defineOptions() {
+ $options = parent::defineOptions();
+
+ $options['comments'] = ['default' => FALSE];
+
+ return $options;
+ }
+
+ public function buildOptionsForm(&$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']),
+ ];
+ }
+ }
+
+ 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 $this->renderLink(drupal_render($build), $values);
+ }
+ }
+
+}