public function col_allocatedmarker(stdClass $row) {
        static $markers = null;
        static $markerlist = array();
        if ($markers === null) {
            list($sort, $params) = users_order_by_sql('u');
            // Only enrolled users could be assigned as potential markers.
            $markers = get_enrolled_users($this->assignment->get_context(), 'mod/assign:grade', 0, 'u.*', $sort);
            $markerlist[0] = get_string('choosemarker', 'assign');
            $viewfullnames = has_capability('moodle/site:viewfullnames', $this->assignment->get_context());
            foreach ($markers as $marker) {
                $markerlist[$marker->id] = fullname($marker, $viewfullnames);
            }
        }
        if (empty($markerlist)) {
            // TODO: add some form of notification here that no markers are available.
            return '';
        }
        if ($this->is_downloading()) {
            if (isset($markers[$row->allocatedmarker])) {
                return fullname($markers[$row->allocatedmarker],
                        has_capability('moodle/site:viewfullnames', $this->assignment->get_context()));
            } else {
                return '';
            }
        }

        if ($this->quickgrading && has_capability('mod/assign:manageallocations', $this->assignment->get_context()) &&
            (empty($row->workflowstate) ||
             $row->workflowstate == ASSIGN_MARKING_WORKFLOW_STATE_INMARKING ||
             $row->workflowstate == ASSIGN_MARKING_WORKFLOW_STATE_NOTMARKED)) {

            $name = 'quickgrade_' . $row->id . '_allocatedmarker';
            return  html_writer::select($markerlist, $name, $row->allocatedmarker, false);
        } else if (!empty($row->allocatedmarker)) {
            $output = '';
            if ($this->quickgrading) { // Add hidden field for quickgrading page.
                $name = 'quickgrade_' . $row->id . '_allocatedmarker';
                $attributes = ['type' => 'hidden', 'name' => $name, 'value' => $row->allocatedmarker];
                $output .= html_writer::empty_tag('input', $attributes);
            }
            $output .= $markerlist[$row->allocatedmarker];
            return $output;
        }
    }