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Differences Between: [Versions 39 and 311] [Versions 39 and 400] [Versions 39 and 401] [Versions 39 and 402] [Versions 39 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * A moodleform to edit the grade options for an individual grade category
  19   *
  20   * @package   core_grades
  21   * @copyright 2007 Petr Skoda
  22   * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   */
  24  
  25  if (!defined('MOODLE_INTERNAL')) {
  26      die('Direct access to this script is forbidden.');    ///  It must be included from a Moodle page
  27  }
  28  
  29  require_once $CFG->libdir.'/formslib.php';
  30  
  31  class edit_category_form extends moodleform {
  32      private $aggregation_options = array();
  33  
  34      function definition() {
  35          global $CFG, $COURSE, $DB, $OUTPUT;
  36          $mform =& $this->_form;
  37  
  38          $category = $this->_customdata['current'];
  39  
  40          $this->aggregation_options = grade_helper::get_aggregation_strings();
  41  
  42          // visible elements
  43          $mform->addElement('header', 'headercategory', get_string('gradecategory', 'grades'));
  44          $mform->addElement('text', 'fullname', get_string('categoryname', 'grades'));
  45          $mform->setType('fullname', PARAM_TEXT);
  46          $mform->addRule('fullname', null, 'required', null, 'client');
  47  
  48          $mform->addElement('select', 'aggregation', get_string('aggregation', 'grades'), $this->aggregation_options);
  49          $mform->addHelpButton('aggregation', 'aggregation', 'grades');
  50  
  51          if ((int)$CFG->grade_aggregation_flag & 2) {
  52              $mform->setAdvanced('aggregation');
  53          }
  54  
  55          $mform->addElement('checkbox', 'aggregateonlygraded', get_string('aggregateonlygraded', 'grades'));
  56          $mform->addHelpButton('aggregateonlygraded', 'aggregateonlygraded', 'grades');
  57  
  58          if ((int)$CFG->grade_aggregateonlygraded_flag & 2) {
  59              $mform->setAdvanced('aggregateonlygraded');
  60          }
  61  
  62          if (empty($CFG->enableoutcomes)) {
  63              $mform->addElement('hidden', 'aggregateoutcomes');
  64              $mform->setType('aggregateoutcomes', PARAM_INT);
  65          } else {
  66              $mform->addElement('checkbox', 'aggregateoutcomes', get_string('aggregateoutcomes', 'grades'));
  67              $mform->addHelpButton('aggregateoutcomes', 'aggregateoutcomes', 'grades');
  68              if ((int)$CFG->grade_aggregateoutcomes_flag & 2) {
  69                  $mform->setAdvanced('aggregateoutcomes');
  70              }
  71          }
  72  
  73          $mform->addElement('text', 'keephigh', get_string('keephigh', 'grades'), 'size="3"');
  74          $mform->setType('keephigh', PARAM_INT);
  75          $mform->addHelpButton('keephigh', 'keephigh', 'grades');
  76          if ((int)$CFG->grade_keephigh_flag & 2) {
  77              $mform->setAdvanced('keephigh');
  78          }
  79  
  80          $mform->addElement('text', 'droplow', get_string('droplow', 'grades'), 'size="3"');
  81          $mform->setType('droplow', PARAM_INT);
  82          $mform->addHelpButton('droplow', 'droplow', 'grades');
  83          $mform->disabledIf('droplow', 'keephigh', 'noteq', 0);
  84          if ((int)$CFG->grade_droplow_flag & 2) {
  85              $mform->setAdvanced('droplow');
  86          }
  87  
  88          $mform->disabledIf('keephigh', 'droplow', 'noteq', 0);
  89          $mform->disabledIf('droplow', 'keephigh', 'noteq', 0);
  90  
  91          // Grade item settings
  92          // Displayed as Category total to avoid confusion between grade items requiring marking and category totals
  93          $mform->addElement('header', 'general', get_string('categorytotal', 'grades'));
  94  
  95          $mform->addElement('text', 'grade_item_itemname', get_string('categorytotalname', 'grades'));
  96          $mform->setType('grade_item_itemname', PARAM_TEXT);
  97          $mform->setAdvanced('grade_item_itemname');
  98  
  99          $mform->addElement('text', 'grade_item_iteminfo', get_string('iteminfo', 'grades'));
 100          $mform->addHelpButton('grade_item_iteminfo', 'iteminfo', 'grades');
 101          $mform->setType('grade_item_iteminfo', PARAM_TEXT);
 102  
 103          $mform->addElement('text', 'grade_item_idnumber', get_string('idnumbermod'));
 104          $mform->addHelpButton('grade_item_idnumber', 'idnumbermod');
 105          $mform->setType('grade_item_idnumber', PARAM_RAW);
 106  
 107          if (!empty($category->id)) {
 108              $gradecategory = grade_category::fetch(array('id' => $category->id));
 109              $gradeitem = $gradecategory->load_grade_item();
 110  
 111              // If grades exist set a message so the user knows why they can not alter the grade type or scale.
 112              // We could never change the grade type for external items, so only need to show this for manual grade items.
 113              if ($gradeitem->has_overridden_grades()) {
 114                  // Set a message so the user knows why the can not alter the grade type or scale.
 115                  if ($gradeitem->gradetype == GRADE_TYPE_SCALE) {
 116                      $gradesexistmsg = get_string('modgradecategorycantchangegradetyporscalemsg', 'grades');
 117                  } else {
 118                      $gradesexistmsg = get_string('modgradecategorycantchangegradetypemsg', 'grades');
 119                  }
 120                  $notification = new \core\output\notification($gradesexistmsg, \core\output\notification::NOTIFY_INFO);
 121                  $notification->set_show_closebutton(false);
 122                  $mform->addElement('static', 'gradesexistmsg', '', $OUTPUT->render($notification));
 123              }
 124          }
 125  
 126          $options = array(GRADE_TYPE_NONE=>get_string('typenone', 'grades'),
 127                           GRADE_TYPE_VALUE=>get_string('typevalue', 'grades'),
 128                           GRADE_TYPE_SCALE=>get_string('typescale', 'grades'),
 129                           GRADE_TYPE_TEXT=>get_string('typetext', 'grades'));
 130  
 131          $mform->addElement('select', 'grade_item_gradetype', get_string('gradetype', 'grades'), $options);
 132          $mform->addHelpButton('grade_item_gradetype', 'gradetype', 'grades');
 133          $mform->setDefault('grade_item_gradetype', GRADE_TYPE_VALUE);
 134          $mform->disabledIf('grade_item_gradetype', 'aggregation', 'eq', GRADE_AGGREGATE_SUM);
 135  
 136          //$mform->addElement('text', 'calculation', get_string('calculation', 'grades'));
 137          //$mform->disabledIf('calculation', 'gradetype', 'eq', GRADE_TYPE_TEXT);
 138          //$mform->disabledIf('calculation', 'gradetype', 'eq', GRADE_TYPE_NONE);
 139  
 140          $options = array(0=>get_string('usenoscale', 'grades'));
 141          if ($scales = grade_scale::fetch_all_local($COURSE->id)) {
 142              foreach ($scales as $scale) {
 143                  $options[$scale->id] = $scale->get_name();
 144              }
 145          }
 146          if ($scales = grade_scale::fetch_all_global()) {
 147              foreach ($scales as $scale) {
 148                  $options[$scale->id] = $scale->get_name();
 149              }
 150          }
 151          // ugly BC hack - it was possible to use custom scale from other courses :-(
 152          if (!empty($category->grade_item_scaleid) and !isset($options[$category->grade_item_scaleid])) {
 153              if ($scale = grade_scale::fetch(array('id'=>$category->grade_item_scaleid))) {
 154                  $options[$scale->id] = $scale->get_name().' '.get_string('incorrectcustomscale', 'grades');
 155              }
 156          }
 157          $mform->addElement('select', 'grade_item_scaleid', get_string('scale'), $options);
 158          $mform->addHelpButton('grade_item_scaleid', 'typescale', 'grades');
 159          $mform->disabledIf('grade_item_scaleid', 'grade_item_gradetype', 'noteq', GRADE_TYPE_SCALE);
 160          $mform->disabledIf('grade_item_scaleid', 'aggregation', 'eq', GRADE_AGGREGATE_SUM);
 161  
 162          $choices = array();
 163          $choices[''] = get_string('choose');
 164          $choices['no'] = get_string('no');
 165          $choices['yes'] = get_string('yes');
 166          $mform->addElement('select', 'grade_item_rescalegrades', get_string('modgradecategoryrescalegrades', 'grades'), $choices);
 167          $mform->addHelpButton('grade_item_rescalegrades', 'modgradecategoryrescalegrades', 'grades');
 168          $mform->disabledIf('grade_item_rescalegrades', 'grade_item_gradetype', 'noteq', GRADE_TYPE_VALUE);
 169  
 170          $mform->addElement('text', 'grade_item_grademax', get_string('grademax', 'grades'));
 171          $mform->setType('grade_item_grademax', PARAM_RAW);
 172          $mform->addHelpButton('grade_item_grademax', 'grademax', 'grades');
 173          $mform->disabledIf('grade_item_grademax', 'grade_item_gradetype', 'noteq', GRADE_TYPE_VALUE);
 174          $mform->disabledIf('grade_item_grademax', 'aggregation', 'eq', GRADE_AGGREGATE_SUM);
 175  
 176          if ((bool) get_config('moodle', 'grade_report_showmin')) {
 177              $mform->addElement('text', 'grade_item_grademin', get_string('grademin', 'grades'));
 178              $mform->setType('grade_item_grademin', PARAM_RAW);
 179              $mform->addHelpButton('grade_item_grademin', 'grademin', 'grades');
 180              $mform->disabledIf('grade_item_grademin', 'grade_item_gradetype', 'noteq', GRADE_TYPE_VALUE);
 181              $mform->disabledIf('grade_item_grademin', 'aggregation', 'eq', GRADE_AGGREGATE_SUM);
 182          }
 183  
 184          $mform->addElement('text', 'grade_item_gradepass', get_string('gradepass', 'grades'));
 185          $mform->setType('grade_item_gradepass', PARAM_RAW);
 186          $mform->addHelpButton('grade_item_gradepass', 'gradepass', 'grades');
 187          $mform->disabledIf('grade_item_gradepass', 'grade_item_gradetype', 'eq', GRADE_TYPE_NONE);
 188          $mform->disabledIf('grade_item_gradepass', 'grade_item_gradetype', 'eq', GRADE_TYPE_TEXT);
 189  
 190          /// grade display prefs
 191          $default_gradedisplaytype = grade_get_setting($COURSE->id, 'displaytype', $CFG->grade_displaytype);
 192          $options = array(GRADE_DISPLAY_TYPE_DEFAULT            => get_string('default', 'grades'),
 193                           GRADE_DISPLAY_TYPE_REAL               => get_string('real', 'grades'),
 194                           GRADE_DISPLAY_TYPE_PERCENTAGE         => get_string('percentage', 'grades'),
 195                           GRADE_DISPLAY_TYPE_LETTER             => get_string('letter', 'grades'),
 196                           GRADE_DISPLAY_TYPE_REAL_PERCENTAGE    => get_string('realpercentage', 'grades'),
 197                           GRADE_DISPLAY_TYPE_REAL_LETTER        => get_string('realletter', 'grades'),
 198                           GRADE_DISPLAY_TYPE_LETTER_REAL        => get_string('letterreal', 'grades'),
 199                           GRADE_DISPLAY_TYPE_LETTER_PERCENTAGE  => get_string('letterpercentage', 'grades'),
 200                           GRADE_DISPLAY_TYPE_PERCENTAGE_LETTER  => get_string('percentageletter', 'grades'),
 201                           GRADE_DISPLAY_TYPE_PERCENTAGE_REAL    => get_string('percentagereal', 'grades')
 202                           );
 203  
 204          asort($options);
 205  
 206          foreach ($options as $key=>$option) {
 207              if ($key == $default_gradedisplaytype) {
 208                  $options[GRADE_DISPLAY_TYPE_DEFAULT] = get_string('defaultprev', 'grades', $option);
 209                  break;
 210              }
 211          }
 212          $mform->addElement('select', 'grade_item_display', get_string('gradedisplaytype', 'grades'), $options);
 213          $mform->addHelpButton('grade_item_display', 'gradedisplaytype', 'grades');
 214          $mform->disabledIf('grade_item_display', 'grade_item_gradetype', 'in',
 215              array(GRADE_TYPE_TEXT, GRADE_TYPE_NONE));
 216  
 217          $default_gradedecimals = grade_get_setting($COURSE->id, 'decimalpoints', $CFG->grade_decimalpoints);
 218          $options = array(-1=>get_string('defaultprev', 'grades', $default_gradedecimals), 0=>0, 1=>1, 2=>2, 3=>3, 4=>4, 5=>5);
 219          $mform->addElement('select', 'grade_item_decimals', get_string('decimalpoints', 'grades'), $options);
 220          $mform->addHelpButton('grade_item_decimals', 'decimalpoints', 'grades');
 221          $mform->setDefault('grade_item_decimals', -1);
 222          $mform->disabledIf('grade_item_decimals', 'grade_item_display', 'eq', GRADE_DISPLAY_TYPE_LETTER);
 223          $mform->disabledIf('grade_item_decimals', 'grade_item_gradetype', 'in',
 224              array(GRADE_TYPE_TEXT, GRADE_TYPE_NONE));
 225  
 226          if ($default_gradedisplaytype == GRADE_DISPLAY_TYPE_LETTER) {
 227              $mform->disabledIf('grade_item_decimals', 'grade_item_display', "eq", GRADE_DISPLAY_TYPE_DEFAULT);
 228          }
 229  
 230          /// hiding
 231          // advcheckbox is not compatible with disabledIf!
 232          $mform->addElement('checkbox', 'grade_item_hidden', get_string('hidden', 'grades'));
 233          $mform->addHelpButton('grade_item_hidden', 'hidden', 'grades');
 234          $mform->addElement('date_time_selector', 'grade_item_hiddenuntil', get_string('hiddenuntil', 'grades'), array('optional'=>true));
 235          $mform->disabledIf('grade_item_hidden', 'grade_item_hiddenuntil[off]', 'notchecked');
 236  
 237          /// locking
 238          $mform->addElement('checkbox', 'grade_item_locked', get_string('locked', 'grades'));
 239          $mform->addHelpButton('grade_item_locked', 'locked', 'grades');
 240  
 241          $mform->addElement('date_time_selector', 'grade_item_locktime', get_string('locktime', 'grades'), array('optional'=>true));
 242          $mform->disabledIf('grade_item_locktime', 'grade_item_gradetype', 'eq', GRADE_TYPE_NONE);
 243  
 244  /// parent category related settings
 245          $mform->addElement('header', 'headerparent', get_string('parentcategory', 'grades'));
 246  
 247          $mform->addElement('advcheckbox', 'grade_item_weightoverride', get_string('adjustedweight', 'grades'));
 248          $mform->addHelpButton('grade_item_weightoverride', 'weightoverride', 'grades');
 249  
 250          $mform->addElement('text', 'grade_item_aggregationcoef2', get_string('weight', 'grades'));
 251          $mform->addHelpButton('grade_item_aggregationcoef2', 'weight', 'grades');
 252          $mform->setType('grade_item_aggregationcoef2', PARAM_RAW);
 253          $mform->disabledIf('grade_item_aggregationcoef2', 'grade_item_weightoverride');
 254  
 255          $options = array();
 256          $default = -1;
 257          $categories = grade_category::fetch_all(array('courseid'=>$COURSE->id));
 258  
 259          foreach ($categories as $cat) {
 260              $cat->apply_forced_settings();
 261              $options[$cat->id] = $cat->get_name();
 262              if ($cat->is_course_category()) {
 263                  $default = $cat->id;
 264              }
 265          }
 266  
 267          if (count($categories) > 1) {
 268              $mform->addElement('select', 'parentcategory', get_string('parentcategory', 'grades'), $options);
 269              $mform->setDefault('parentcategory', $default);
 270              $mform->addElement('static', 'currentparentaggregation', get_string('currentparentaggregation', 'grades'));
 271          }
 272  
 273          // hidden params
 274          $mform->addElement('hidden', 'id', 0);
 275          $mform->setType('id', PARAM_INT);
 276  
 277          $mform->addElement('hidden', 'courseid', 0);
 278          $mform->setType('courseid', PARAM_INT);
 279  
 280  /// add return tracking info
 281          $gpr = $this->_customdata['gpr'];
 282          $gpr->add_mform_elements($mform);
 283  
 284  /// mark advanced according to site settings
 285          if (isset($CFG->grade_item_advanced)) {
 286              $advanced = explode(',', $CFG->grade_item_advanced);
 287              foreach ($advanced as $el) {
 288                  $el = 'grade_item_'.$el;
 289                  if ($mform->elementExists($el)) {
 290                      $mform->setAdvanced($el);
 291                  }
 292              }
 293          }
 294  
 295  //-------------------------------------------------------------------------------
 296          // buttons
 297          $this->add_action_buttons();
 298  //-------------------------------------------------------------------------------
 299          $this->set_data($category);
 300      }
 301  
 302  
 303  /// tweak the form - depending on existing data
 304      function definition_after_data() {
 305          global $CFG, $COURSE;
 306  
 307          $mform =& $this->_form;
 308  
 309          $somecat = new grade_category();
 310  
 311          foreach ($somecat->forceable as $property) {
 312              if ((int)$CFG->{"grade_{$property}_flag"} & 1) {
 313                  if ($mform->elementExists($property)) {
 314                      if (empty($CFG->grade_hideforcedsettings)) {
 315                          $mform->hardFreeze($property);
 316                      } else {
 317                          if ($mform->elementExists($property)) {
 318                              $mform->removeElement($property);
 319                          }
 320                      }
 321                  }
 322              }
 323          }
 324  
 325          if ($CFG->grade_droplow > 0) {
 326              if ($mform->elementExists('keephigh')) {
 327                  $mform->removeElement('keephigh');
 328              }
 329          } else if ($CFG->grade_keephigh > 0) {
 330              if ($mform->elementExists('droplow')) {
 331                  $mform->removeElement('droplow');
 332              }
 333          }
 334  
 335          if ($id = $mform->getElementValue('id')) {
 336              $grade_category = grade_category::fetch(array('id'=>$id));
 337              $grade_item = $grade_category->load_grade_item();
 338  
 339              // remove agg coef if not used
 340              if ($grade_category->is_course_category()) {
 341                  if ($mform->elementExists('parentcategory')) {
 342                      $mform->removeElement('parentcategory');
 343                  }
 344                  if ($mform->elementExists('currentparentaggregation')) {
 345                      $mform->removeElement('currentparentaggregation');
 346                  }
 347  
 348              } else {
 349                  // if we wanted to change parent of existing category - we would have to verify there are no circular references in parents!!!
 350                  if ($mform->elementExists('parentcategory')) {
 351                      $mform->hardFreeze('parentcategory');
 352                  }
 353                  $parent_cat = $grade_category->get_parent_category();
 354                  $mform->setDefault('currentparentaggregation', $this->aggregation_options[$parent_cat->aggregation]);
 355  
 356              }
 357  
 358              // Prevent the user from using drop lowest/keep highest when the aggregation method cannot handle it.
 359              if (!$grade_category->can_apply_limit_rules()) {
 360                  if ($mform->elementExists('keephigh')) {
 361                      $mform->setConstant('keephigh', 0);
 362                      $mform->hardFreeze('keephigh');
 363                  }
 364                  if ($mform->elementExists('droplow')) {
 365                      $mform->setConstant('droplow', 0);
 366                      $mform->hardFreeze('droplow');
 367                  }
 368              }
 369  
 370              if ($grade_item->is_calculated()) {
 371                  // following elements are ignored when calculation formula used
 372                  if ($mform->elementExists('aggregation')) {
 373                      $mform->removeElement('aggregation');
 374                  }
 375                  if ($mform->elementExists('keephigh')) {
 376                      $mform->removeElement('keephigh');
 377                  }
 378                  if ($mform->elementExists('droplow')) {
 379                      $mform->removeElement('droplow');
 380                  }
 381                  if ($mform->elementExists('aggregateonlygraded')) {
 382                      $mform->removeElement('aggregateonlygraded');
 383                  }
 384                  if ($mform->elementExists('aggregateoutcomes')) {
 385                      $mform->removeElement('aggregateoutcomes');
 386                  }
 387              }
 388  
 389              // If it is a course category, remove the "required" rule from the "fullname" element
 390              if ($grade_category->is_course_category()) {
 391                  unset($mform->_rules['fullname']);
 392                  $key = array_search('fullname', $mform->_required);
 393                  unset($mform->_required[$key]);
 394              }
 395  
 396              // If it is a course category and its fullname is ?, show an empty field
 397              if ($grade_category->is_course_category() && $mform->getElementValue('fullname') == '?') {
 398                  $mform->setDefault('fullname', '');
 399              }
 400              // remove unwanted aggregation options
 401              if ($mform->elementExists('aggregation')) {
 402                  $allaggoptions = array_keys($this->aggregation_options);
 403                  $agg_el =& $mform->getElement('aggregation');
 404                  $visible = explode(',', $CFG->grade_aggregations_visible);
 405                  if (!is_null($grade_category->aggregation)) {
 406                      // current type is always visible
 407                      $visible[] = $grade_category->aggregation;
 408                  }
 409                  foreach ($allaggoptions as $type) {
 410                      if (!in_array($type, $visible)) {
 411                          $agg_el->removeOption($type);
 412                      }
 413                  }
 414              }
 415  
 416          } else {
 417              // adding new category
 418              if ($mform->elementExists('currentparentaggregation')) {
 419                  $mform->removeElement('currentparentaggregation');
 420              }
 421              // remove unwanted aggregation options
 422              if ($mform->elementExists('aggregation')) {
 423                  $allaggoptions = array_keys($this->aggregation_options);
 424                  $agg_el =& $mform->getElement('aggregation');
 425                  $visible = explode(',', $CFG->grade_aggregations_visible);
 426                  foreach ($allaggoptions as $type) {
 427                      if (!in_array($type, $visible)) {
 428                          $agg_el->removeOption($type);
 429                      }
 430                  }
 431              }
 432  
 433              $mform->removeElement('grade_item_rescalegrades');
 434          }
 435  
 436  
 437          // no parent header for course category
 438          if (!$mform->elementExists('parentcategory')) {
 439              $mform->removeElement('headerparent');
 440          }
 441  
 442  /// GRADE ITEM
 443          if ($id = $mform->getElementValue('id')) {
 444              $grade_category = grade_category::fetch(array('id'=>$id));
 445              $grade_item = $grade_category->load_grade_item();
 446  
 447              $mform->setDefault('grade_item_hidden', (int) $grade_item->hidden);
 448  
 449              if ($grade_item->is_outcome_item()) {
 450                  // we have to prevent incompatible modifications of outcomes if outcomes disabled
 451                  $mform->removeElement('grade_item_grademax');
 452                  if ($mform->elementExists('grade_item_grademin')) {
 453                      $mform->removeElement('grade_item_grademin');
 454                  }
 455                  $mform->removeElement('grade_item_gradetype');
 456                  $mform->removeElement('grade_item_display');
 457                  $mform->removeElement('grade_item_decimals');
 458                  $mform->hardFreeze('grade_item_scaleid');
 459              // Only show the option to rescale grades on a category if its corresponding grade_item has overridden grade_grades.
 460              } else if ($grade_item->has_overridden_grades()) {
 461                  // Can't change the grade type or the scale if there are grades.
 462                  $mform->hardFreeze('grade_item_gradetype, grade_item_scaleid');
 463  
 464                  // If we are using scles then remove the unnecessary rescale and grade fields.
 465                  if ($grade_item->gradetype == GRADE_TYPE_SCALE) {
 466                      $mform->removeElement('grade_item_rescalegrades');
 467                      $mform->removeElement('grade_item_grademax');
 468                      if ($mform->elementExists('grade_item_grademin')) {
 469                          $mform->removeElement('grade_item_grademin');
 470                      }
 471                  } else { // Not using scale, so remove it.
 472                      $mform->removeElement('grade_item_scaleid');
 473                      $mform->disabledIf('grade_item_grademax', 'grade_item_rescalegrades', 'eq', '');
 474                      $mform->disabledIf('grade_item_grademin', 'grade_item_rescalegrades', 'eq', '');
 475                  }
 476              } else { // Remove the rescale element if there are no grades.
 477                  $mform->removeElement('grade_item_rescalegrades');
 478              }
 479  
 480              //remove the aggregation coef element if not needed
 481              if ($grade_item->is_course_item()) {
 482                  if ($mform->elementExists('grade_item_aggregationcoef')) {
 483                      $mform->removeElement('grade_item_aggregationcoef');
 484                  }
 485  
 486                  if ($mform->elementExists('grade_item_weightoverride')) {
 487                      $mform->removeElement('grade_item_weightoverride');
 488                  }
 489                  if ($mform->elementExists('grade_item_aggregationcoef2')) {
 490                      $mform->removeElement('grade_item_aggregationcoef2');
 491                  }
 492              } else {
 493                  if ($grade_item->is_category_item()) {
 494                      $category = $grade_item->get_item_category();
 495                      $parent_category = $category->get_parent_category();
 496                  } else {
 497                      $parent_category = $grade_item->get_parent_category();
 498                  }
 499  
 500                  $parent_category->apply_forced_settings();
 501  
 502                  if (!$parent_category->is_aggregationcoef_used()) {
 503                      if ($mform->elementExists('grade_item_aggregationcoef')) {
 504                          $mform->removeElement('grade_item_aggregationcoef');
 505                      }
 506                  } else {
 507  
 508                      $coefstring = $grade_item->get_coefstring();
 509  
 510                      if ($coefstring == 'aggregationcoefextrasum' || $coefstring == 'aggregationcoefextraweightsum') {
 511                          // advcheckbox is not compatible with disabledIf!
 512                          $coefstring = 'aggregationcoefextrasum';
 513                          $element =& $mform->createElement('checkbox', 'grade_item_aggregationcoef', get_string($coefstring, 'grades'));
 514                      } else {
 515                          $element =& $mform->createElement('text', 'grade_item_aggregationcoef', get_string($coefstring, 'grades'));
 516                      }
 517                      $mform->insertElementBefore($element, 'parentcategory');
 518                      $mform->addHelpButton('grade_item_aggregationcoef', $coefstring, 'grades');
 519                  }
 520  
 521                  // Remove fields used by natural weighting if the parent category is not using natural weighting.
 522                  // Or if the item is a scale and scales are not used in aggregation.
 523                  if ($parent_category->aggregation != GRADE_AGGREGATE_SUM
 524                          || (empty($CFG->grade_includescalesinaggregation) && $grade_item->gradetype == GRADE_TYPE_SCALE)) {
 525                      if ($mform->elementExists('grade_item_weightoverride')) {
 526                          $mform->removeElement('grade_item_weightoverride');
 527                      }
 528                      if ($mform->elementExists('grade_item_aggregationcoef2')) {
 529                          $mform->removeElement('grade_item_aggregationcoef2');
 530                      }
 531                  }
 532              }
 533          }
 534      }
 535  
 536  /// perform extra validation before submission
 537      function validation($data, $files) {
 538          global $COURSE;
 539          $gradeitem = false;
 540          if ($data['id']) {
 541              $gradecategory = grade_category::fetch(array('id' => $data['id']));
 542              $gradeitem = $gradecategory->load_grade_item();
 543          }
 544  
 545          $errors = parent::validation($data, $files);
 546  
 547          if (array_key_exists('grade_item_gradetype', $data) and $data['grade_item_gradetype'] == GRADE_TYPE_SCALE) {
 548              if (empty($data['grade_item_scaleid'])) {
 549                  $errors['grade_item_scaleid'] = get_string('missingscale', 'grades');
 550              }
 551          }
 552          if (array_key_exists('grade_item_grademin', $data) and array_key_exists('grade_item_grademax', $data)) {
 553              if (($data['grade_item_grademax'] != 0 OR $data['grade_item_grademin'] != 0) AND
 554                  ($data['grade_item_grademax'] == $data['grade_item_grademin'] OR
 555                   $data['grade_item_grademax'] < $data['grade_item_grademin'])) {
 556                   $errors['grade_item_grademin'] = get_string('incorrectminmax', 'grades');
 557                   $errors['grade_item_grademax'] = get_string('incorrectminmax', 'grades');
 558               }
 559          }
 560  
 561          if ($data['id'] && $gradeitem->has_overridden_grades()) {
 562              if ($gradeitem->gradetype == GRADE_TYPE_VALUE) {
 563                  if (grade_floats_different($data['grade_item_grademin'], $gradeitem->grademin) ||
 564                      grade_floats_different($data['grade_item_grademax'], $gradeitem->grademax)) {
 565                      if (empty($data['grade_item_rescalegrades'])) {
 566                          $errors['grade_item_rescalegrades'] = get_string('mustchooserescaleyesorno', 'grades');
 567                      }
 568                  }
 569              }
 570          }
 571          return $errors;
 572      }
 573  }
 574  
 575