grade/lib.php

   1 <?php //$Id$
   2
   3 require_once $CFG->libdir.'/gradelib.php';
   4
   5 /**
   6  * Print grading plugin selection popup form.
   7  *
   8  * @param int $courseid id of course
   9  * @param string $active_type type of plugin on current page - import, export, report or edit
  10  * @param string $active_plugin active plugin type - grader, user, cvs, ...
  11  * @param boolean $return return as string
  12  * @return nothing or string if $return true
  13  */
  14 function print_grade_plugin_selector($courseid, $active_type, $active_plugin, $return=false) {
  15     global $CFG;
  16
  17     $context = get_context_instance(CONTEXT_COURSE, $courseid);
  18
  19     $menu = array();
  20
  21     $active = '';
  22
  23 /// report plugins with its special structure
  24     if ($reports = get_list_of_plugins('grade/report', 'CVS')) {         // Get all installed reports
  25         foreach ($reports as $key => $plugin) {                      // Remove ones we can't see
  26             if (!has_capability('gradereport/'.$plugin.':view', $context)) {
  27                 unset($reports[$key]);
  28             }
  29         }
  30     }
  31     $reportnames = array();
  32     if (!empty($reports)) {
  33         foreach ($reports as $plugin) {
  34             $url = 'report/'.$plugin.'/index.php?id='.$courseid;
  35             if ($active_type == 'report' and $active_plugin == $plugin ) {
  36                 $active = $url;
  37             }
  38             $reportnames[$url] = get_string('modulename', 'gradereport_'.$plugin, NULL, $CFG->dirroot.'/grade/report/'.$plugin.'lang/');
  39         }
  40         asort($reportnames);
  41     }
  42     if (!empty($reportnames)) {
  43         $menu['reportgroup']='--'.get_string('reportplugins', 'grades');
  44         $menu = $menu+$reportnames;
  45     }
  46
  47 /// standard import plugins
  48     if ($imports = get_list_of_plugins('grade/import', 'CVS')) {         // Get all installed import plugins
  49         foreach ($imports as $key => $plugin) {                      // Remove ones we can't see
  50             if (!has_capability('gradeimport/'.$plugin.':view', $context)) {
  51                 unset($imports[$key]);
  52             }
  53         }
  54     }
  55     $importnames = array();
  56     if (!empty($imports)) {
  57         foreach ($imports as $plugin) {
  58             $url = 'import/'.$plugin.'/index.php?id='.$courseid;
  59             if ($active_type == 'import' and $active_plugin == $plugin ) {
  60                 $active = $url;
  61             }
  62             $importnames[$url] = get_string('modulename', 'gradeimport_'.$plugin, NULL, $CFG->dirroot.'/grade/import/'.$plugin.'lang/');
  63         }
  64         asort($importnames);
  65     }
  66     if (!empty($importnames)) {
  67         $menu['importgroup']='--'.get_string('importplugins', 'grades');
  68         $menu = $menu+$importnames;
  69     }
  70
  71 /// standard export plugins
  72     if ($exports = get_list_of_plugins('grade/export', 'CVS')) {         // Get all installed export plugins
  73         foreach ($exports as $key => $plugin) {                      // Remove ones we can't see
  74             if (!has_capability('gradeexport/'.$plugin.':view', $context)) {
  75                 unset($exports[$key]);
  76             }
  77         }
  78     }
  79     $exportnames = array();
  80     if (!empty($exports)) {
  81         foreach ($exports as $plugin) {
  82             $url = 'export/'.$plugin.'/index.php?id='.$courseid;
  83             if ($active_type == 'export' and $active_plugin == $plugin ) {
  84                 $active = $url;
  85             }
  86             $exportnames[$url] = get_string('modulename', 'gradeexport_'.$plugin, NULL, $CFG->dirroot.'/grade/export/'.$plugin.'lang/');
  87         }
  88         asort($exportnames);
  89     }
  90     if (!empty($exportnames)) {
  91         $menu['exportgroup']='--'.get_string('exportplugins', 'grades');
  92         $menu = $menu+$exportnames;
  93     }
  94
  95 /// editing scripts - not real plugins
  96     if (has_capability('moodle/grade:manage', $context)) {
  97         $menu['edit']='--'.get_string('edit');
  98         $url = 'edit/tree.php?id='.$courseid;
  99         if ($active_type == 'edit' and $active_plugin == 'tree' ) {
 100             $active = $url;
 101         }
 102         $menu[$url] = get_string('edittree', 'grades');
 103     }
 104
 105 /// finally print/return the popup form
 106     return popup_form($CFG->wwwroot.'/grade/', $menu, 'choosepluginreport', $active, 'choose', '', '', $return, 'self', get_string('view'));
 107 }
 108
 109 /**
 110  * Utility class used for return tracking when using edit and other forms in grade plugins
 111  */
 112 class grade_plugin_return {
 113     var $type;
 114     var $plugin;
 115     var $courseid;
 116     var $userid;
 117     var $page;
 118
 119     /**
 120      * Constructor
 121      * @param array $params - associative array with return parameters, if null parameter are taken from _GET or _POST
 122      */
 123     function grade_plugin_return ($params=null) {
 124         if (empty($params)) {
 125             $this->type     = optional_param('gpr_type', null, PARAM_SAFEDIR);
 126             $this->plugin   = optional_param('gpr_plugin', null, PARAM_SAFEDIR);
 127             $this->courseid = optional_param('gpr_courseid', null, PARAM_INT);
 128             $this->userid   = optional_param('gpr_userid', null, PARAM_INT);
 129             $this->page     = optional_param('gpr_page', null, PARAM_INT);
 130
 131         } else {
 132             foreach ($params as $key=>$value) {
 133                 if (array_key_exists($key, $this)) {
 134                     $this->$key = $value;
 135                 }
 136             }
 137         }
 138     }
 139
 140     /**
 141      * Returns return parameters as options array suitable for buttons.
 142      * @return array options
 143      */
 144     function get_options() {
 145         if (empty($this->type)) {
 146             return array();
 147         }
 148
 149         $params = array();
 150
 151         if (!empty($this->plugin)) {
 152             $params['plugin'] = $this->plugin;
 153         }
 154
 155         if (!empty($this->courseid)) {
 156             $params['id'] = $this->courseid;
 157         }
 158
 159         if (!empty($this->userid)) {
 160             $params['userid'] = $this->userid;
 161         }
 162
 163         if (!empty($this->page)) {
 164             $params['page'] = $this->page;
 165         }
 166
 167         return $params;
 168     }
 169
 170     /**
 171      * Returns return url
 172      * @param string $default default url when params not set
 173      * @return string url
 174      */
 175     function get_return_url($default, $extras=null) {
 176         global $CFG;
 177
 178         if ($this->type == 'edit') {
 179             return $CFG->wwwroot.'/grade/edit/tree.php?id='.$this->courseid;
 180         }
 181
 182         if (empty($this->type) or empty($this->plugin)) {
 183             return $default;
 184         }
 185
 186         $url = $CFG->wwwroot.'/grade/'.$this->type.'/'.$this->plugin.'/index.php';
 187         $glue = '?';
 188
 189         if (!empty($this->courseid)) {
 190             $url .= $glue.'id='.$this->courseid;
 191             $glue = '&amp;';
 192         }
 193
 194         if (!empty($this->userid)) {
 195             $url .= $glue.'userid='.$this->userid;
 196             $glue = '&amp;';
 197         }
 198
 199         if (!empty($this->page)) {
 200             $url .= $glue.'page='.$this->page;
 201             $glue = '&amp;';
 202         }
 203
 204         if (!empty($extras)) {
 205             foreach($extras as $key=>$value) {
 206                 $url .= $glue.$key.'='.$value;
 207                 $glue = '&amp;';
 208             }
 209         }
 210
 211         return $url;
 212     }
 213
 214     /**
 215      * Returns string with hidden return tracking form elements.
 216      * @return string
 217      */
 218     function get_form_fields() {
 219         if (empty($this->type)) {
 220             return '';
 221         }
 222
 223         $result  = '<input type="hidden" name="gpr_type" value="'.$this->type.'" />';
 224
 225         if (!empty($this->plugin)) {
 226             $result .= '<input type="hidden" name="gpr_plugin" value="'.$this->plugin.'" />';
 227         }
 228
 229         if (!empty($this->courseid)) {
 230             $result .= '<input type="hidden" name="gpr_courseid" value="'.$this->courseid.'" />';
 231         }
 232
 233         if (!empty($this->userid)) {
 234             $result .= '<input type="hidden" name="gpr_userid" value="'.$this->userid.'" />';
 235         }
 236
 237         if (!empty($this->page)) {
 238             $result .= '<input type="hidden" name="gpr_page" value="'.$this->page.'" />';
 239         }
 240     }
 241
 242     /**
 243      * Add hidden elements into mform
 244      * @param object $mform moodle form object
 245      * @return void
 246      */
 247     function add_mform_elements(&$mform) {
 248         if (empty($this->type)) {
 249             return;
 250         }
 251
 252         $mform->addElement('hidden', 'gpr_type', $this->type);
 253         $mform->setType('gpr_type', PARAM_SAFEDIR);
 254
 255         if (!empty($this->plugin)) {
 256             $mform->addElement('hidden', 'gpr_plugin', $this->plugin);
 257             $mform->setType('gpr_plugin', PARAM_SAFEDIR);
 258         }
 259
 260         if (!empty($this->courseid)) {
 261             $mform->addElement('hidden', 'gpr_courseid', $this->courseid);
 262             $mform->setType('gpr_courseid', PARAM_INT);
 263         }
 264
 265         if (!empty($this->userid)) {
 266             $mform->addElement('hidden', 'gpr_userid', $this->userid);
 267             $mform->setType('gpr_userid', PARAM_INT);
 268         }
 269
 270         if (!empty($this->page)) {
 271             $mform->addElement('hidden', 'gpr_page', $this->page);
 272             $mform->setType('gpr_page', PARAM_INT);
 273         }
 274     }
 275
 276     /**
 277      * Add return tracking params into url
 278      * @param string $url
 279      * @return string $url with erturn tracking params
 280      */
 281     function add_url_params($url) {
 282         if (empty($this->type)) {
 283             return $url;
 284         }
 285
 286         if (strpos($url, '?') === false) {
 287             $url .= '?gpr_type='.$this->type;
 288         } else {
 289             $url .= '&amp;gpr_type='.$this->type;
 290         }
 291
 292         if (!empty($this->plugin)) {
 293             $url .= '&amp;gpr_plugin='.$this->plugin;
 294         }
 295
 296         if (!empty($this->courseid)) {
 297             $url .= '&amp;gpr_courseid='.$this->courseid;
 298         }
 299
 300         if (!empty($this->userid)) {
 301             $url .= '&amp;gpr_userid='.$this->userid;
 302         }
 303
 304         if (!empty($this->page)) {
 305             $url .= '&amp;gpr_page='.$this->page;
 306         }
 307
 308         return $url;
 309     }
 310 }
 311
 312
 313 /**
 314  * This class represents a complete tree of categories, grade_items and final grades,
 315  * organises as an array primarily, but which can also be converted to other formats.
 316  * It has simple method calls with complex implementations, allowing for easy insertion,
 317  * deletion and moving of items and categories within the tree.
 318  */
 319 class grade_tree {
 320
 321     /**
 322      * The basic representation of the tree as a hierarchical, 3-tiered array.
 323      * @var object $top_element
 324      */
 325     var $top_element;
 326
 327     /**
 328      * A string of GET URL variables, namely courseid and sesskey, used in most URLs built by this class.
 329      * @var string $commonvars
 330      */
 331     var $commonvars;
 332
 333     /**
 334      * 2D array of grade items and categories
 335      */
 336     var $levels;
 337
 338     /**
 339      * Course context
 340      */
 341     var $context;
 342
 343     /**
 344      * Constructor, retrieves and stores a hierarchical array of all grade_category and grade_item
 345      * objects for the given courseid. Full objects are instantiated.
 346      * and renumbering.
 347      * @param int $courseid
 348      * @param boolean $fillers include fillers and colspans, make the levels var "rectangular"
 349      * @param boolean $category_grade_last category grade item is the last child
 350      * @param array $collapsed array of collapsed categories
 351      */
 352     function grade_tree($courseid, $fillers=true, $category_grade_last=false, $collapsed=null) {
 353         global $USER, $CFG;
 354
 355         $this->courseid   = $courseid;
 356         $this->commonvars = "&amp;sesskey=$USER->sesskey&amp;id=$this->courseid";
 357         $this->levels     = array();
 358         $this->context    = get_context_instance(CONTEXT_COURSE, $courseid);
 359
 360         // get course grade tree
 361         $this->top_element = grade_category::fetch_course_tree($courseid, true);
 362
 363         // collapse the categories if requested
 364         if (!empty($collapsed)) {
 365             grade_tree::category_collapse($this->top_element, $collapsed);
 366         }
 367
 368         // move category item to last position in category
 369         if ($category_grade_last) {
 370             grade_tree::category_grade_last($this->top_element);
 371         }
 372
 373         if ($fillers) {
 374             // inject fake categories == fillers
 375             grade_tree::inject_fillers($this->top_element, 0);
 376             // add colspans to categories and fillers
 377             grade_tree::inject_colspans($this->top_element);
 378         }
 379
 380         grade_tree::fill_levels($this->levels, $this->top_element, 0);
 381     }
 382
 383     /**
 384      * Static recursive helper - removes items from collapsed categories
 385      * @static
 386      * @param array $element The seed of the recursion
 387      * @param array $collapsed array of collapsed categories
 388      * @return void
 389      */
 390     function category_collapse(&$element, $collapsed) {
 391         if ($element['type'] != 'category') {
 392             return;
 393         }
 394         if (empty($element['children']) or count($element['children']) < 2) {
 395             return;
 396         }
 397
 398         if (in_array($element['object']->id, $collapsed)) {
 399             $category_item = reset($element['children']); //keep only category item
 400             $element['children'] = array(key($element['children'])=>$category_item);
 401
 402         } else {
 403             foreach ($element['children'] as $sortorder=>$child) {
 404                 grade_tree::category_collapse($element['children'][$sortorder], $collapsed);
 405             }
 406         }
 407     }
 408
 409     /**
 410      * Static recursive helper - makes the grade_item for category the last children
 411      * @static
 412      * @param array $element The seed of the recursion
 413      * @return void
 414      */
 415     function category_grade_last(&$element) {
 416         if (empty($element['children'])) {
 417             return;
 418         }
 419         if (count($element['children']) < 2) {
 420             return;
 421         }
 422         $category_item = reset($element['children']);
 423         $order = key($element['children']);
 424         unset($element['children'][$order]);
 425         $element['children'][$order] =& $category_item;
 426         foreach ($element['children'] as $sortorder=>$child) {
 427             grade_tree::category_grade_last($element['children'][$sortorder]);
 428         }
 429     }
 430
 431     /**
 432      * Static recursive helper - fills the levels array, useful when accessing tree elements of one level
 433      * @static
 434      * @param int $levels
 435      * @param array $element The seed of the recursion
 436      * @param int $depth
 437      * @return void
 438      */
 439     function fill_levels(&$levels, &$element, $depth) {
 440         if (!array_key_exists($depth, $levels)) {
 441             $levels[$depth] = array();
 442         }
 443
 444         // prepare unique identifier
 445         if ($element['type'] == 'category') {
 446             $element['eid'] = 'c'.$element['object']->id;
 447         } else if (in_array($element['type'], array('item', 'courseitem', 'categoryitem'))) {
 448             $element['eid'] = 'i'.$element['object']->id;
 449         }
 450
 451         $levels[$depth][] =& $element;
 452         $depth++;
 453         if (empty($element['children'])) {
 454             return;
 455         }
 456         $prev = 0;
 457         foreach ($element['children'] as $sortorder=>$child) {
 458             grade_tree::fill_levels($levels, $element['children'][$sortorder], $depth);
 459             $element['children'][$sortorder]['prev'] = $prev;
 460             $element['children'][$sortorder]['next'] = 0;
 461             if ($prev) {
 462                 $element['children'][$prev]['next'] = $sortorder;
 463             }
 464             $prev = $sortorder;
 465         }
 466     }
 467
 468     /**
 469      * Static recursive helper - makes full tree (all leafes are at the same level)
 470      */
 471     function inject_fillers(&$element, $depth) {
 472         $depth++;
 473
 474         if (empty($element['children'])) {
 475             return $depth;
 476         }
 477         $chdepths = array();
 478         $chids = array_keys($element['children']);
 479         $last_child  = end($chids);
 480         $first_child = reset($chids);
 481
 482         foreach ($chids as $chid) {
 483             $chdepths[$chid] = grade_tree::inject_fillers($element['children'][$chid], $depth);
 484         }
 485         arsort($chdepths);
 486
 487         $maxdepth = reset($chdepths);
 488         foreach ($chdepths as $chid=>$chd) {
 489             if ($chd == $maxdepth) {
 490                 continue;
 491             }
 492             for ($i=0; $i < $maxdepth-$chd; $i++) {
 493                 if ($chid == $first_child) {
 494                     $type = 'fillerfirst';
 495                 } else if ($chid == $last_child) {
 496                     $type = 'fillerlast';
 497                 } else {
 498                     $type = 'filler';
 499                 }
 500                 $oldchild =& $element['children'][$chid];
 501                 $element['children'][$chid] = array('object'=>'filler', 'type'=>$type, 'eid'=>'', 'depth'=>$element['object']->depth,'children'=>array($oldchild));
 502             }
 503         }
 504
 505         return $maxdepth;
 506     }
 507
 508     /**
 509      * Static recursive helper - add colspan information into categories
 510      */
 511     function inject_colspans(&$element) {
 512         if (empty($element['children'])) {
 513             return 1;
 514         }
 515         $count = 0;
 516         foreach ($element['children'] as $key=>$child) {
 517             $count += grade_tree::inject_colspans($element['children'][$key]);
 518         }
 519         $element['colspan'] = $count;
 520         return $count;
 521     }
 522
 523     /**
 524      * Parses the array in search of a given eid and returns a element object with
 525      * information about the element it has found.
 526      * @param int $eid
 527      * @return object element
 528      */
 529     function locate_element($eid) {
 530         if (strpos($eid, 'g') === 0) {
 531             // it is a grade  construct a new object
 532             $id = (int)substr($eid, 1);
 533             if (!$grade = grade_grade::fetch(array('id'=>$id))) {
 534                 return null;
 535             }
 536             //extra security check - the grade item must be in this tree
 537             if (!$item_el = $this->locate_element('i'.$grade->itemid)) {
 538                 return null;
 539             }
 540             $grade->grade_item =& $item_el['object']; // this may speedup grade_grade methods!
 541             return array('eid'=>'g'.$id,'object'=>$grade, 'type'=>'grade');
 542         }
 543
 544         // it is a category or item
 545         foreach ($this->levels as $row) {
 546             foreach ($row as $element) {
 547                 if ($element['type'] == 'filler') {
 548                     continue;
 549                 }
 550                 if ($element['eid'] == $eid) {
 551                     return $element;
 552                 }
 553             }
 554         }
 555
 556         return null;
 557     }
 558
 559     /**
 560      * Return edit icon for give element
 561      * @param object $element
 562      * @return string
 563      */
 564     function get_edit_icon($element, $gpr) {
 565         global $CFG;
 566
 567         if (!has_capability('moodle/grade:manage', $this->context)) {
 568             return '';
 569         }
 570
 571         static $stredit = null;
 572         if (is_null($stredit)) {
 573             $stredit = get_string('edit');
 574         }
 575
 576         $object = $element['object'];
 577         $overlib = '';
 578
 579         switch ($element['type']) {
 580             case 'item':
 581             case 'categoryitem':
 582             case 'courseitem':
 583                 if (empty($object->outcomeid)) {
 584                     $url = $CFG->wwwroot.'/grade/edit/item.php?courseid='.$this->courseid.'&amp;id='.$object->id;
 585                 } else {
 586                     $url = $CFG->wwwroot.'/grade/edit/outcomeitem.php?courseid='.$this->courseid.'&amp;id='.$object->id;
 587                 }
 588                 $url = $gpr->add_url_params($url);
 589                 break;
 590
 591             case 'category':
 592                 $url = $CFG->wwwroot.'/grade/edit/category.php?courseid='.$this->courseid.'&amp;id='.$object->id;
 593                 $url = $gpr->add_url_params($url);
 594                 break;
 595
 596             case 'grade':
 597                 //TODO: improve dealing with new grades
 598                 $url = $CFG->wwwroot.'/grade/edit/grade.php?courseid='.$this->courseid.'&amp;id='.$object->id;
 599                 $url = $gpr->add_url_params($url);
 600                 if (!empty($object->feedback)) {
 601                     $feedback = format_text($object->feedback, $object->feedbackformat);
 602                     $function = "return overlib('".s(ltrim($object->feedback)."', FULLHTML);");
 603                     $overlib = 'onmouseover="'.$function.'" onmouseout="return nd();"';
 604                 }
 605                 break;
 606
 607             default:
 608                 $url = null;
 609         }
 610
 611         if ($url) {
 612             return '<a href="'.$url.'"><img '.$overlib.' src="'.$CFG->pixpath.'/t/edit.gif" class="iconsmall" alt="'.$stredit.'" title="'.$stredit.'"/></a>';
 613
 614         } else {
 615             return '';
 616         }
 617     }
 618
 619     /**
 620      * Return hiding icon for give element
 621      * @param object $element
 622      * @return string
 623      */
 624     function get_hiding_icon($element, $gpr) {
 625         global $CFG;
 626
 627         if (!has_capability('moodle/grade:manage', $this->context) and !has_capability('moodle/grade:hide', $this->context)) {
 628             return '';
 629         }
 630
 631         static $strshow = null;
 632         static $strhide   = null;
 633         if (is_null($strshow)) {
 634             $strshow = get_string('show');
 635             $strhide = get_string('hide');
 636         }
 637
 638         if ($element['object']->is_hidden()) {
 639             $url     = $CFG->wwwroot.'/grade/edit/action.php?id='.$this->courseid.'&amp;action=show&amp;sesskey='.sesskey().'&amp;eid='.$element['eid'];
 640             $url     = $gpr->add_url_params($url);
 641             $action  = '<a href="'.$url.'"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.$strshow.'" title="'.$strshow.'"/></a>';
 642
 643         } else {
 644             $url     = $CFG->wwwroot.'/grade/edit/action.php?id='.$this->courseid.'&amp;action=hide&amp;sesskey='.sesskey().'&amp;eid='.$element['eid'];
 645             $url     = $gpr->add_url_params($url);
 646             $action  = '<a href="'.$url.'"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.$strhide.'" title="'.$strhide.'"/></a>';
 647         }
 648         return $action;
 649     }
 650
 651     /**
 652      * Return locking icon for give element
 653      * @param object $element
 654      * @return string
 655      */
 656     function get_locking_icon($element, $gpr) {
 657         global $CFG;
 658
 659         static $strunlock = null;
 660         static $strlock   = null;
 661         if (is_null($strunlock)) {
 662             $strunlock = get_string('unlock', 'grades');
 663             $strlock   = get_string('lock', 'grades');
 664         }
 665
 666         if ($element['object']->is_locked()) {
 667             if (!has_capability('moodle/grade:manage', $this->context) and !has_capability('moodle/grade:unlock', $this->context)) {
 668                 return '';
 669             }
 670             $url     = $CFG->wwwroot.'/grade/edit/action.php?id='.$this->courseid.'&amp;action=unlock&amp;sesskey='.sesskey().'&amp;eid='.$element['eid'];
 671             $url     = $gpr->add_url_params($url);
 672             $action  = '<a href="'.$url.'"><img src="'.$CFG->pixpath.'/t/unlock.gif" class="iconsmall" alt="'.$strunlock.'" title="'.$strunlock.'"/></a>';
 673
 674         } else {
 675             if (!has_capability('moodle/grade:manage', $this->context) and !has_capability('moodle/grade:lock', $this->context)) {
 676                 return '';
 677             }
 678             $url     = $CFG->wwwroot.'/grade/edit/action.php?id='.$this->courseid.'&amp;action=lock&amp;sesskey='.sesskey().'&amp;eid='.$element['eid'];
 679             $url     = $gpr->add_url_params($url);
 680             $action  = '<a href="'.$url.'"><img src="'.$CFG->pixpath.'/t/lock.gif" class="iconsmall" alt="'.$strlock.'" title="'.$strlock.'"/></a>';
 681         }
 682         return $action;
 683     }
 684
 685     /**
 686      * Return calculation icon for given element
 687      * @param object $element
 688      * @return string
 689      */
 690     function get_calculation_icon($element, $gpr) {
 691         global $CFG;
 692         if (!has_capability('moodle/grade:manage', $this->context)) {
 693             return '';
 694         }
 695
 696         $calculation_icon = '';
 697
 698         $type   = $element['type'];
 699         $object = $element['object'];
 700
 701         if ($type == 'item' or $type == 'courseitem' or $type == 'categoryitem') {
 702             $streditcalculation = get_string('editcalculation', 'grades');
 703
 704             // show calculation icon only when calculation possible
 705             if (!$object->is_normal_item() and ($object->gradetype == GRADE_TYPE_SCALE or $object->gradetype == GRADE_TYPE_VALUE)) {
 706                 $url = $CFG->wwwroot.'/grade/edit/calculation.php?courseid='.$this->courseid.'&amp;id='.$object->id;
 707                 $url = $gpr->add_url_params($url);
 708                 $calculation_icon = '<a href="'. $url.'"><img src="'.$CFG->pixpath.'/t/calc.gif" class="iconsmall" alt="'
 709                                        . $streditcalculation.'" title="'.$streditcalculation.'" /></a>'. "\n";
 710             }
 711         }
 712
 713         return $calculation_icon;
 714     }
 715 }
 716
 717 ?>