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536 lines
26 KiB
536 lines
26 KiB
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Drop down form element to select the grade
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*
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* Contains HTML class for a drop down element to select the grade for an activity,
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* used in mod update form
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*
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* @package core_form
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* @copyright 2006 Jamie Pratt <me@jamiep.org>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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global $CFG;
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require_once "$CFG->libdir/form/select.php";
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require_once("HTML/QuickForm/element.php");
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require_once($CFG->dirroot.'/lib/form/group.php');
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require_once($CFG->dirroot.'/lib/grade/grade_scale.php');
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/**
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* Drop down form element to select the grade
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*
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* HTML class for a drop down element to select the grade for an activity,
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* used in mod update form
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*
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* @package core_form
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* @category form
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* @copyright 2006 Jamie Pratt <me@jamiep.org>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class MoodleQuickForm_modgrade extends MoodleQuickForm_group {
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/** @var boolean $isupdate Is this an add or an update ? */
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public $isupdate = false;
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/** @var float $currentgrade The current grademax for the grade_item */
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public $currentgrade = false;
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/** @var boolean $hasgrades Has this grade_item got any real grades (with values) */
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public $hasgrades = false;
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/** @var boolean $canrescale Does this activity support rescaling grades? */
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public $canrescale = false;
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/** @var int $currentscaleid The current scale id */
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public $currentscaleid = null;
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/** @var string $currentgradetype The current gradetype - can either be 'none', 'scale', or 'point' */
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public $currentgradetype = 'none';
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/** @var boolean $useratings Set to true if the activity is using ratings, false otherwise */
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public $useratings = false;
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/** @var MoodleQuickForm_select $gradetypeformelement */
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private $gradetypeformelement;
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/** @var MoodleQuickForm_select $scaleformelement */
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private $scaleformelement;
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/** @var MoodleQuickForm_text $maxgradeformelement */
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private $maxgradeformelement;
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/**
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* Constructor
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*
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* @param string $elementname Element's name
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* @param mixed $elementlabel Label(s) for an element
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* @param array $options Options to control the element's display. Required - must contain the following options:
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* 'isupdate' - is this a new module or are we editing an existing one?
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* 'currentgrade' - the current grademax in the database for this gradeitem
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* 'hasgrades' - whether or not the grade_item has existing grade_grades
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* 'canrescale' - whether or not the activity supports rescaling grades
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* @param mixed $attributes Either a typical HTML attribute string or an associative array
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*/
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public function __construct($elementname = null, $elementlabel = null, $options = array(), $attributes = null) {
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// TODO MDL-52313 Replace with the call to parent::__construct().
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HTML_QuickForm_element::__construct($elementname, $elementlabel, $attributes);
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$this->_persistantFreeze = true;
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$this->_appendName = true;
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$this->_type = 'modgrade';
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$this->isupdate = !empty($options['isupdate']);
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if (isset($options['currentgrade'])) {
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$this->currentgrade = $options['currentgrade'];
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}
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if (isset($options['currentgradetype'])) {
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$gradetype = $options['currentgradetype'];
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switch ($gradetype) {
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case GRADE_TYPE_NONE :
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$this->currentgradetype = 'none';
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break;
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case GRADE_TYPE_SCALE :
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$this->currentgradetype = 'scale';
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break;
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case GRADE_TYPE_VALUE :
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$this->currentgradetype = 'point';
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break;
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}
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}
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if (isset($options['currentscaleid'])) {
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$this->currentscaleid = $options['currentscaleid'];
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}
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$this->hasgrades = !empty($options['hasgrades']);
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$this->canrescale = !empty($options['canrescale']);
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$this->useratings = !empty($options['useratings']);
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}
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/**
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* Old syntax of class constructor. Deprecated in PHP7.
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*
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* @deprecated since Moodle 3.1
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*/
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public function MoodleQuickForm_modgrade($elementname = null, $elementlabel = null, $options = array(), $attributes = null) {
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debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
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self::__construct($elementname, $elementlabel, $options, $attributes);
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}
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/**
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* Create elements for this group.
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*/
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public function _createElements() {
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global $COURSE, $CFG, $OUTPUT;
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$attributes = $this->getAttributes();
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if (is_null($attributes)) {
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$attributes = array();
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}
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$this->_elements = array();
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// Create main elements
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// We have to create the scale and point elements first, as we need their IDs.
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// Grade scale select box.
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$scales = get_scales_menu($COURSE->id);
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$langscale = get_string('modgradetypescale', 'grades');
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$this->scaleformelement = $this->createFormElement('select', 'modgrade_scale', $langscale,
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$scales, $attributes);
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$this->scaleformelement->setHiddenLabel(true);
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$scaleformelementid = $this->generate_modgrade_subelement_id('modgrade_scale');
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$this->scaleformelement->updateAttributes(array('id' => $scaleformelementid));
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// Maximum grade textbox.
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$langmaxgrade = get_string('modgrademaxgrade', 'grades');
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$this->maxgradeformelement = $this->createFormElement('text', 'modgrade_point', $langmaxgrade, array());
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$this->maxgradeformelement->setHiddenLabel(true);
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$maxgradeformelementid = $this->generate_modgrade_subelement_id('modgrade_point');
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$this->maxgradeformelement->updateAttributes(array('id' => $maxgradeformelementid));
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// Grade type select box.
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$gradetype = array(
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'none' => get_string('modgradetypenone', 'grades'),
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'scale' => get_string('modgradetypescale', 'grades'),
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'point' => get_string('modgradetypepoint', 'grades'),
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);
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$langtype = get_string('modgradetype', 'grades');
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$this->gradetypeformelement = $this->createFormElement('select', 'modgrade_type', $langtype, $gradetype,
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$attributes, true);
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$this->gradetypeformelement->setHiddenLabel(true);
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$gradetypeformelementid = $this->generate_modgrade_subelement_id('modgrade_type');
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$this->gradetypeformelement->updateAttributes(array('id' => $gradetypeformelementid));
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if ($this->isupdate && $this->hasgrades) {
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$this->gradetypeformelement->updateAttributes(array('disabled' => 'disabled'));
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$this->scaleformelement->updateAttributes(array('disabled' => 'disabled'));
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// Check box for options for processing existing grades.
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if ($this->canrescale) {
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$langrescalegrades = get_string('modgraderescalegrades', 'grades');
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$choices = array();
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$choices[''] = get_string('choose');
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$choices['no'] = get_string('no');
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$choices['yes'] = get_string('yes');
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$rescalegradesselect = $this->createFormElement('select',
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'modgrade_rescalegrades',
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$langrescalegrades,
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$choices);
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$rescalegradesselect->setHiddenLabel(true);
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$rescalegradesselectid = $this->generate_modgrade_subelement_id('modgrade_rescalegrades');
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$rescalegradesselect->updateAttributes(array('id' => $rescalegradesselectid));
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}
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}
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// Add elements.
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if ($this->isupdate && $this->hasgrades) {
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// Set a message so the user knows why they can not alter the grade type or scale.
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if ($this->currentgradetype == 'scale') {
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$gradesexistmsg = get_string('modgradecantchangegradetyporscalemsg', 'grades');
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} else if ($this->canrescale) {
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$gradesexistmsg = get_string('modgradecantchangegradetypemsg', 'grades');
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} else {
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$gradesexistmsg = get_string('modgradecantchangegradetype', 'grades');
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}
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$gradesexisthtml = '<div class=\'alert alert-warning\'>' . $gradesexistmsg . '</div>';
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$this->_elements[] = $this->createFormElement('static', 'gradesexistmsg', '', $gradesexisthtml);
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}
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// Grade type select box.
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$label = html_writer::tag('label', $this->gradetypeformelement->getLabel(),
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array('for' => $this->gradetypeformelement->getAttribute('id')));
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$this->_elements[] = $this->createFormElement('static', 'gradetypelabel', '', ' '.$label);
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$this->_elements[] = $this->gradetypeformelement;
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$this->_elements[] = $this->createFormElement('static', 'gradetypespacer', '', '<br />');
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// Only show the grade scale select box when applicable.
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if (!$this->isupdate || !$this->hasgrades || $this->currentgradetype == 'scale') {
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$label = html_writer::tag('label', $this->scaleformelement->getLabel(),
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array('for' => $this->scaleformelement->getAttribute('id')));
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$this->_elements[] = $this->createFormElement('static', 'scalelabel', '', $label);
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$this->_elements[] = $this->scaleformelement;
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$this->_elements[] = $this->createFormElement('static', 'scalespacer', '', '<br />');
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}
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if ($this->isupdate && $this->hasgrades && $this->canrescale && $this->currentgradetype == 'point') {
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// We need to know how to apply any changes to maxgrade - ie to either update, or don't touch exising grades.
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$label = html_writer::tag('label', $rescalegradesselect->getLabel(),
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array('for' => $rescalegradesselect->getAttribute('id')));
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$labelhelp = new help_icon('modgraderescalegrades', 'grades');
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$this->_elements[] = $this->createFormElement('static', 'scalelabel', '', $label . $OUTPUT->render($labelhelp));
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$this->_elements[] = $rescalegradesselect;
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$this->_elements[] = $this->createFormElement('static', 'scalespacer', '', '<br />');
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}
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// Only show the max points form element when applicable.
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if (!$this->isupdate || !$this->hasgrades || $this->currentgradetype == 'point') {
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$label = html_writer::tag('label', $this->maxgradeformelement->getLabel(),
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array('for' => $this->maxgradeformelement->getAttribute('id')));
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$this->_elements[] = $this->createFormElement('static', 'pointlabel', '', $label);
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$this->_elements[] = $this->maxgradeformelement;
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$this->_elements[] = $this->createFormElement('static', 'pointspacer', '', '<br />');
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}
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}
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/**
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* Calculate the output value for the element as a whole.
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*
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* @param array $submitvalues The incoming values from the form.
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* @param bool $notused Not used.
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* @return array Return value for the element, formatted like field name => value.
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*/
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public function exportValue(&$submitvalues, $notused = false) {
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global $COURSE;
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// Get the values from all the child elements.
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$vals = array();
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foreach ($this->_elements as $element) {
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$thisexport = $element->exportValue($submitvalues[$this->getName()], true);
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if (!is_null($thisexport)) {
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$vals += $thisexport;
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}
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}
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$type = (isset($vals['modgrade_type'])) ? $vals['modgrade_type'] : 'none';
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$point = (isset($vals['modgrade_point'])) ? $vals['modgrade_point'] : null;
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$scale = (isset($vals['modgrade_scale'])) ? $vals['modgrade_scale'] : null;
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$rescalegrades = (isset($vals['modgrade_rescalegrades'])) ? $vals['modgrade_rescalegrades'] : null;
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$return = $this->process_value($type, $scale, $point, $rescalegrades);
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return array($this->getName() => $return, $this->getName() . '_rescalegrades' => $rescalegrades);
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}
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/**
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* Process the value for the group based on the selected grade type, and the input for the scale and point elements.
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*
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* @param string $type The value of the grade type select box. Can be 'none', 'scale', or 'point'
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* @param string|int $scale The value of the scale select box.
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* @param string|int $point The value of the point grade textbox.
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* @param string $rescalegrades The value of the rescalegrades select.
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* @return int The resulting value
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*/
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protected function process_value($type='none', $scale=null, $point=null, $rescalegrades=null) {
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global $COURSE;
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$val = 0;
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if ($this->isupdate && $this->hasgrades && $this->canrescale && $this->currentgradetype == 'point' && empty($rescalegrades)) {
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// If the maxgrade field is disabled with javascript, no value is sent with the form and mform assumes the default.
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// If the user was forced to choose a rescale option - and they haven't - prevent any changes to the max grade.
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return (string)unformat_float($this->currentgrade);
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}
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switch ($type) {
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case 'point':
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if ($this->validate_point($point) === true) {
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$val = (int)$point;
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}
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break;
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case 'scale':
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if ($this->validate_scale($scale)) {
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$val = (int)(-$scale);
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}
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break;
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}
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return $val;
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}
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/**
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* Determines whether a given value is a valid scale selection.
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*
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* @param string|int $val The value to test.
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* @return bool Valid or invalid
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*/
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protected function validate_scale($val) {
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global $COURSE;
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$scales = get_scales_menu($COURSE->id);
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return (!empty($val) && isset($scales[(int)$val])) ? true : false;
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}
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/**
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* Determines whether a given value is a valid point selection.
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*
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* @param string|int $val The value to test.
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* @return bool Valid or invalid
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*/
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protected function validate_point($val) {
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if (empty($val)) {
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return false;
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}
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$maxgrade = (int)get_config('core', 'gradepointmax');
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$isintlike = ((string)(int)$val === $val) ? true : false;
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return ($isintlike === true && $val > 0 && $val <= $maxgrade) ? true : false;
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}
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/**
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* Called by HTML_QuickForm whenever form event is made on this element.
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*
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* @param string $event Name of event
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* @param mixed $arg event arguments
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* @param moodleform $caller calling object
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* @return mixed
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*/
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public function onQuickFormEvent($event, $arg, &$caller) {
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$this->setMoodleForm($caller);
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switch ($event) {
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case 'createElement':
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// The first argument is the name.
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$name = $arg[0];
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// Set disable actions.
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$caller->hideIf($name.'[modgrade_scale]', $name.'[modgrade_type]', 'neq', 'scale');
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$caller->hideIf($name.'[modgrade_point]', $name.'[modgrade_type]', 'neq', 'point');
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$caller->hideIf($name.'[modgrade_rescalegrades]', $name.'[modgrade_type]', 'neq', 'point');
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// Set validation rules for the sub-elements belonging to this element.
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// A handy note: the parent scope of a closure is the function in which the closure was declared.
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// Because of this using $this is safe despite the closures being called statically.
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// A nasty magic hack!
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$checkgradetypechange = function($val) {
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// Nothing is affected by changes to the grade type if there are no grades yet.
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if (!$this->hasgrades) {
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return true;
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}
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// Check if we are changing the grade type when grades are present.
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if (isset($val['modgrade_type']) && $val['modgrade_type'] !== $this->currentgradetype) {
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return false;
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}
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return true;
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};
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$checkscalechange = function($val) {
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// Nothing is affected by changes to the scale if there are no grades yet.
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if (!$this->hasgrades) {
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return true;
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}
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// Check if we are changing the scale type when grades are present.
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// If modgrade_type is empty then use currentgradetype.
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$gradetype = isset($val['modgrade_type']) ? $val['modgrade_type'] : $this->currentgradetype;
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if ($gradetype === 'scale') {
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if (isset($val['modgrade_scale']) && ($val['modgrade_scale'] !== $this->currentscaleid)) {
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return false;
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}
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}
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return true;
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};
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$checkmaxgradechange = function($val) {
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// Nothing is affected by changes to the max grade if there are no grades yet.
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if (!$this->hasgrades) {
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return true;
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}
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// If we are not using ratings we can change the max grade.
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if (!$this->useratings) {
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return true;
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}
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// Check if we are changing the max grade if we are using ratings and there is a grade.
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// If modgrade_type is empty then use currentgradetype.
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$gradetype = isset($val['modgrade_type']) ? $val['modgrade_type'] : $this->currentgradetype;
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if ($gradetype === 'point') {
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if (isset($val['modgrade_point']) &&
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grade_floats_different($this->currentgrade, $val['modgrade_point'])) {
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return false;
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}
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}
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return true;
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};
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$checkmaxgrade = function($val) {
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// Closure to validate a max points value. See the note above about scope if this confuses you.
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// If modgrade_type is empty then use currentgradetype.
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$gradetype = isset($val['modgrade_type']) ? $val['modgrade_type'] : $this->currentgradetype;
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if ($gradetype === 'point') {
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if (isset($val['modgrade_point'])) {
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return $this->validate_point($val['modgrade_point']);
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}
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}
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return true;
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};
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$checkvalidscale = function($val) {
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// Closure to validate a scale value. See the note above about scope if this confuses you.
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// If modgrade_type is empty then use currentgradetype.
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$gradetype = isset($val['modgrade_type']) ? $val['modgrade_type'] : $this->currentgradetype;
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if ($gradetype === 'scale') {
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if (isset($val['modgrade_scale'])) {
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return $this->validate_scale($val['modgrade_scale']);
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}
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}
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return true;
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};
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$checkrescale = function($val) {
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// Nothing is affected by changes to grademax if there are no grades yet.
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if (!$this->isupdate || !$this->hasgrades || !$this->canrescale) {
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return true;
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}
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// Closure to validate a scale value. See the note above about scope if this confuses you.
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// If modgrade_type is empty then use currentgradetype.
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$gradetype = isset($val['modgrade_type']) ? $val['modgrade_type'] : $this->currentgradetype;
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if ($gradetype === 'point' && isset($val['modgrade_point'])) {
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// Work out if the value was actually changed in the form.
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if (grade_floats_different($this->currentgrade, $val['modgrade_point'])) {
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if (empty($val['modgrade_rescalegrades'])) {
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// This was an "edit", the grademax was changed and the process existing setting was not set.
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return false;
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}
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}
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}
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return true;
|
|
};
|
|
|
|
$cantchangegradetype = get_string('modgradecantchangegradetype', 'grades');
|
|
$cantchangemaxgrade = get_string('modgradecantchangeratingmaxgrade', 'grades');
|
|
$maxgradeexceeded = get_string('modgradeerrorbadpoint', 'grades', get_config('core', 'gradepointmax'));
|
|
$invalidscale = get_string('modgradeerrorbadscale', 'grades');
|
|
$cantchangescale = get_string('modgradecantchangescale', 'grades');
|
|
$mustchooserescale = get_string('mustchooserescaleyesorno', 'grades');
|
|
// When creating the rules the sixth arg is $force, we set it to true because otherwise the form
|
|
// will attempt to validate the existence of the element, we don't want this because the element
|
|
// is being created right now and doesn't actually exist as a registered element yet.
|
|
$caller->addRule($name, $cantchangegradetype, 'callback', $checkgradetypechange, 'server', false, true);
|
|
$caller->addRule($name, $cantchangemaxgrade, 'callback', $checkmaxgradechange, 'server', false, true);
|
|
$caller->addRule($name, $maxgradeexceeded, 'callback', $checkmaxgrade, 'server', false, true);
|
|
$caller->addRule($name, $invalidscale, 'callback', $checkvalidscale, 'server', false, true);
|
|
$caller->addRule($name, $cantchangescale, 'callback', $checkscalechange, 'server', false, true);
|
|
$caller->addRule($name, $mustchooserescale, 'callback', $checkrescale, 'server', false, true);
|
|
|
|
break;
|
|
|
|
case 'updateValue':
|
|
// As this is a group element with no value of its own we are only interested in situations where the
|
|
// default value or a constant value are being provided to the actual element.
|
|
// In this case we expect an int that is going to translate to a scale if negative, or to max points
|
|
// if positive.
|
|
|
|
// Set the maximum points field to disabled if the rescale option has not been chosen and there are grades.
|
|
$caller->disabledIf($this->getName() . '[modgrade_point]', $this->getName() .
|
|
'[modgrade_rescalegrades]', 'eq', '');
|
|
|
|
// A constant value should be given as an int.
|
|
// The default value should be an int and be either $CFG->gradepointdefault or whatever was set in set_data().
|
|
$value = $this->_findValue($caller->_constantValues);
|
|
if (null === $value) {
|
|
if ($caller->isSubmitted() && $this->_findValue($caller->_submitValues) !== null) {
|
|
// Submitted values are array, one value for each individual element in this group.
|
|
// When there is submitted data let parent::onQuickFormEvent() process it.
|
|
break;
|
|
}
|
|
$value = $this->_findValue($caller->_defaultValues);
|
|
}
|
|
|
|
if (!is_null($value) && !is_scalar($value)) {
|
|
// Something unexpected (likely an array of subelement values) has been given - this will be dealt
|
|
// with somewhere else - where exactly... likely the subelements.
|
|
debugging('An invalid value (type '.gettype($value).') has arrived at '.__METHOD__, DEBUG_DEVELOPER);
|
|
break;
|
|
}
|
|
|
|
// Set element state for existing data.
|
|
// This is really a pretty hacky thing to do, when data is being set the group element is called
|
|
// with the data first and the subelements called afterwards.
|
|
// This means that the subelements data (inc const and default values) can be overridden by form code.
|
|
// So - when we call this code really we can't be sure that will be the end value for the element.
|
|
if (!empty($this->_elements)) {
|
|
if (!empty($value)) {
|
|
if ($value < 0) {
|
|
$this->gradetypeformelement->setValue('scale');
|
|
$this->scaleformelement->setValue(($value * -1));
|
|
} else if ($value > 0) {
|
|
$this->gradetypeformelement->setValue('point');
|
|
$maxvalue = !empty($this->currentgrade) ? (string)unformat_float($this->currentgrade) : $value;
|
|
$this->maxgradeformelement->setValue($maxvalue);
|
|
}
|
|
} else {
|
|
$this->gradetypeformelement->setValue('none');
|
|
$this->maxgradeformelement->setValue('');
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Always let the parent do its thing!
|
|
return parent::onQuickFormEvent($event, $arg, $caller);
|
|
}
|
|
|
|
/**
|
|
* Generates the id attribute for the subelement of the modgrade group.
|
|
*
|
|
* Uses algorithm similar to what {@link HTML_QuickForm_element::_generateId()}
|
|
* does but takes the name of the wrapping modgrade group into account.
|
|
*
|
|
* @param string $subname the name of the HTML_QuickForm_element in this modgrade group
|
|
* @return string
|
|
*/
|
|
protected function generate_modgrade_subelement_id($subname) {
|
|
$gid = str_replace(array('[', ']'), array('_', ''), $this->getName());
|
|
return clean_param('id_'.$gid.'_'.$subname, PARAM_ALPHANUMEXT);
|
|
}
|
|
}
|
|
|