C:/xampp/htdocs/moodle/lib/form/modgrade.php

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<?php
global $CFG;
require_once "$CFG->libdir/form/select.php";

class MoodleQuickForm_modgrade extends MoodleQuickForm_select{

    var $_hidenograde = false;

    function MoodleQuickForm_modgrade($elementName=null, $elementLabel=null, $attributes=null, $hidenograde=false)
    {
        HTML_QuickForm_element::HTML_QuickForm_element($elementName, $elementLabel, $attributes, null);
        $this->_type = 'modgrade';
        $this->_hidenograde = $hidenograde;

    } //end constructor

    function onQuickFormEvent($event, $arg, &$caller)
    {
        global $COURSE, $CFG, $OUTPUT;
        switch ($event) {
            case 'createElement':
                // Need to call superclass first because we want the constructor
                // to run.
                $result = parent::onQuickFormEvent($event, $arg, $caller);
                $strscale = get_string('scale');
                $strscales = get_string('scales');
                $scales = get_scales_menu($COURSE->id);
                foreach ($scales as $i => $scalename) {
                    $grades[-$i] = $strscale .': '. $scalename;
                }
                if (!$this->_hidenograde) {
                    $grades[0] = get_string('nograde');
                }
                for ($i=100; $i>=1; $i--) {
                    $grades[$i] = $i;
                }
                $this->load($grades);
                //TODO: rewrite mod grading support in modforms
                return $result;
        }
        return parent::onQuickFormEvent($event, $arg, $caller);
    }

}