moodle/course/editsection_form.php

<?php

if (!defined('MOODLE_INTERNAL')) {
    die('Direct access to this script is forbidden.');    ///  It must be included from a Moodle page
}

require_once($CFG->libdir.'/formslib.php');

class editsection_form extends moodleform {

    function definition() {
        global $CFG, $DB;

        $mform  = $this->_form;
        $course = $this->_customdata['course'];

        $mform->addElement('checkbox', 'usedefaultname', get_string('sectionusedefaultname'));
        $mform->setDefault('usedefaultname', true);

        $mform->addElement('text', 'name', get_string('sectionname'), array('size'=>'30'));
        $mform->setType('name', PARAM_TEXT);
        $mform->disabledIf('name','usedefaultname','checked');

        /// Prepare course and the editor

        $mform->addElement('editor', 'summary_editor', get_string('summary'), null, $this->_customdata['editoroptions']);
        $mform->addHelpButton('summary_editor', 'summary');
        $mform->setType('summary_editor', PARAM_RAW);

        $mform->addElement('hidden', 'id');
        $mform->setType('id', PARAM_INT);

//--------------------------------------------------------------------------------
        $this->add_action_buttons();

    }
}