问如何在contao详细信息页和列表页中获取事件前一次和下一次事件？f.e <上一事件\当前事件( id - 4) \ Next事件>

EN

<?php

$this->getEventUrl = function($objEvent)
{
  global $objPage;
  return \Controller::generateFrontendUrl($objPage->row(), '/' . $objEvent->alias, null, true );
};

$objNextEvent = \CalendarEventsModel::findOneBy(
  array("startDate > ?", "published = '1'", "pid = ?"), 
  array($this->startDate, $this->pid), 
  array('order' => 'startDate ASC'));
$objPreviousEvent = \CalendarEventsModel::findOneBy(
  array("startDate < ?", "published = '1'", "pid = ?"), 
  array($this->startDate, $this->pid), 
  array('order' => 'startDate DESC'));

?>

<?php if ($objPreviousEvent || $objNextEvent): ?>
  <div class="pagination">
    <?php if ($objPreviousEvent): ?>
    <div class="prev">
      <a href="<?= $this->getEventUrl( $objPreviousEvent ) ?>" title="<?= $objPreviousEvent->title ?>">
        &laquo;&nbsp;<?= $objPreviousEvent->title ?>
      </a>
    </div>
    <?php endif ?>
    <?php if ($objNextEvent): ?>
    <div class="next">
      <a href="<?= $this->getEventUrl( $objNextEvent ) ?>" title="<?= $objNextEvent->title ?>">
        <?= $objNextEvent->title ?>&nbsp;&raquo;
      </a>
    </div>
    <?php endif ?>
  </div>
<?php endif ?>