protected function PluginRevisionController::buildRevisionsNavigation in Diff 8

Creates navigation links between the previous changes and the new ones.

Parameters

\Drupal\Core\Entity\ContentEntityInterface $entity: The entity to be compared.

array $revision_ids: The revision ids.

int $left_revision_id: Revision id of the left revision.

int $right_revision_id: Revision id of the right revision.

string $filter: The filter.

Return value

array The revision navigation links.

1 call to PluginRevisionController::buildRevisionsNavigation()

PluginRevisionController::compareEntityRevisions in src/Controller/PluginRevisionController.php

Returns a table which shows the differences between two entity revisions.

File

src/Controller/PluginRevisionController.php, line 234

Class

PluginRevisionController

Base class for controllers that return responses on entity revision routes.

Namespace

Drupal\diff\Controller

Code

protected function buildRevisionsNavigation(ContentEntityInterface $entity, array $revision_ids, $left_revision_id, $right_revision_id, $filter) {
  $revisions_count = count($revision_ids);
  $layout_options =& drupal_static(__FUNCTION__);
  if (!isset($layout_options)) {
    $layout_options = UrlHelper::filterQueryParameters($this->requestStack
      ->getCurrentRequest()->query
      ->all(), [
      'page',
    ]);
  }

  // If there are only 2 revision return an empty row.
  if ($revisions_count == 2) {
    return [];
  }
  else {
    $left_link = $right_link = '';
    $element = [
      '#type' => 'item',
      '#title' => $this
        ->t('Navigation'),
      '#wrapper_attributes' => [
        'class' => 'diff-navigation',
      ],
    ];
    $i = 0;

    // Find the previous revision.
    while ($left_revision_id > $revision_ids[$i]) {
      $i += 1;
    }
    if ($i != 0) {

      // Build the left link.
      $left_link = Link::fromTextAndUrl($this
        ->t('Previous change'), $this
        ->diffRoute($entity, $revision_ids[$i - 1], $left_revision_id, $filter, $layout_options))
        ->toString();
    }
    $element['left'] = [
      '#type' => 'markup',
      '#markup' => $left_link,
      '#prefix' => '<div class="diff-navigation__link prev-link">',
      '#suffix' => '</div>',
    ];

    // Find the next revision.
    $i = 0;
    while ($i < $revisions_count && $right_revision_id >= $revision_ids[$i]) {
      $i += 1;
    }
    if ($revisions_count != $i && $revision_ids[$i - 1] != $revision_ids[$revisions_count - 1]) {

      // Build the right link.
      $right_link = Link::fromTextAndUrl($this
        ->t('Next change'), $this
        ->diffRoute($entity, $right_revision_id, $revision_ids[$i], $filter, $layout_options))
        ->toString();
    }
    $element['right'] = [
      '#type' => 'markup',
      '#markup' => $right_link,
      '#prefix' => '<div class="diff-navigation__link next-link">',
      '#suffix' => '</div>',
    ];
    return $element;
  }
}