public function display($course, $orphaned) {
        $courserenderer = $this->page->get_renderer('core', 'course');
        $output = '';
        $modinfo = get_fast_modinfo($course);
        if ($orphaned) {
            if (!empty($modinfo->sections[1])) {
                $output .= $this->output->heading(get_string('orphaned', 'format_singleactivity'), 3, 'sectionname');
                $output .= $this->output->box(get_string('orphanedwarning', 'format_singleactivity'));
                $output .= $courserenderer->course_section_cm_list($course, 1, 1);
            }
        } else {
            $output .= $courserenderer->course_section_cm_list($course, 0, 0);
            if (empty($modinfo->sections[0]) && course_get_format($course)->activity_has_subtypes()) {
                // Course format was unable to automatically redirect to add module page.
                $output .= $courserenderer->course_section_add_cm_control($course, 0, 0);
            }
        }
        return $output;
    }