08552f2419ace54260d395e5406ebcace72caf24
[moodle.git] / mod / assign / gradingtable.php
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/>.
17 /**
18  * This file contains the definition for the grading table which subclassses easy_table
19  *
20  * @package   mod_assign
21  * @copyright 2012 NetSpot {@link http://www.netspot.com.au}
22  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
23  */
25 defined('MOODLE_INTERNAL') || die();
27 require_once($CFG->libdir.'/tablelib.php');
28 require_once($CFG->libdir.'/gradelib.php');
29 require_once($CFG->dirroot.'/mod/assign/locallib.php');
31 /**
32  * Extends table_sql to provide a table of assignment submissions
33  *
34  * @package   mod_assign
35  * @copyright 2012 NetSpot {@link http://www.netspot.com.au}
36  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
37  */
38 class assign_grading_table extends table_sql implements renderable {
39     /** @var assign $assignment */
40     private $assignment = null;
41     /** @var int $perpage */
42     private $perpage = 10;
43     /** @var int $rownum (global index of current row in table) */
44     private $rownum = -1;
45     /** @var renderer_base for getting output */
46     private $output = null;
47     /** @var stdClass gradinginfo */
48     private $gradinginfo = null;
49     /** @var int $tablemaxrows */
50     private $tablemaxrows = 10000;
51     /** @var boolean $quickgrading */
52     private $quickgrading = false;
53     /** @var boolean $hasgrantextension - Only do the capability check once for the entire table */
54     private $hasgrantextension = false;
55     /** @var boolean $hasgrade - Only do the capability check once for the entire table */
56     private $hasgrade = false;
57     /** @var array $groupsubmissions - A static cache of group submissions */
58     private $groupsubmissions = array();
59     /** @var array $submissiongroups - A static cache of submission groups */
60     private $submissiongroups = array();
61     /** @var string $plugingradingbatchoperations - List of plugin supported batch operations */
62     public $plugingradingbatchoperations = array();
63     /** @var array $plugincache - A cache of plugin lookups to match a column name to a plugin efficiently */
64     private $plugincache = array();
65     /** @var array $scale - A list of the keys and descriptions for the custom scale */
66     private $scale = null;
68     /**
69      * overridden constructor keeps a reference to the assignment class that is displaying this table
70      *
71      * @param assign $assignment The assignment class
72      * @param int $perpage how many per page
73      * @param string $filter The current filter
74      * @param int $rowoffset For showing a subsequent page of results
75      * @param bool $quickgrading Is this table wrapped in a quickgrading form?
76      * @param string $downloadfilename
77      */
78     public function __construct(assign $assignment,
79                                 $perpage,
80                                 $filter,
81                                 $rowoffset,
82                                 $quickgrading,
83                                 $downloadfilename = null) {
84         global $CFG, $PAGE, $DB, $USER;
85         parent::__construct('mod_assign_grading');
86         $this->assignment = $assignment;
88         // Check permissions up front.
89         $this->hasgrantextension = has_capability('mod/assign:grantextension',
90                                                   $this->assignment->get_context());
91         $this->hasgrade = $this->assignment->can_grade();
93         // Check if we have the elevated view capablities to see the blind details.
94         $this->hasviewblind = has_capability('mod/assign:viewblinddetails',
95                 $this->assignment->get_context());
97         foreach ($assignment->get_feedback_plugins() as $plugin) {
98             if ($plugin->is_visible() && $plugin->is_enabled()) {
99                 foreach ($plugin->get_grading_batch_operations() as $action => $description) {
100                     if (empty($this->plugingradingbatchoperations)) {
101                         $this->plugingradingbatchoperations[$plugin->get_type()] = array();
102                     }
103                     $this->plugingradingbatchoperations[$plugin->get_type()][$action] = $description;
104                 }
105             }
106         }
107         $this->perpage = $perpage;
108         $this->quickgrading = $quickgrading && $this->hasgrade;
109         $this->output = $PAGE->get_renderer('mod_assign');
111         $urlparams = array('action'=>'grading', 'id'=>$assignment->get_course_module()->id);
112         $url = new moodle_url($CFG->wwwroot . '/mod/assign/view.php', $urlparams);
113         $this->define_baseurl($url);
115         // Do some business - then set the sql.
116         $currentgroup = groups_get_activity_group($assignment->get_course_module(), true);
118         if ($rowoffset) {
119             $this->rownum = $rowoffset - 1;
120         }
122         $users = array_keys( $assignment->list_participants($currentgroup, true));
123         if (count($users) == 0) {
124             // Insert a record that will never match to the sql is still valid.
125             $users[] = -1;
126         }
128         $params = array();
129         $params['assignmentid1'] = (int)$this->assignment->get_instance()->id;
130         $params['assignmentid2'] = (int)$this->assignment->get_instance()->id;
131         $params['assignmentid3'] = (int)$this->assignment->get_instance()->id;
133         $extrauserfields = get_extra_user_fields($this->assignment->get_context());
135         $fields = user_picture::fields('u', $extrauserfields) . ', ';
136         $fields .= 'u.id as userid, ';
137         $fields .= 's.status as status, ';
138         $fields .= 's.id as submissionid, ';
139         $fields .= 's.timecreated as firstsubmission, ';
140         $fields .= 's.timemodified as timesubmitted, ';
141         $fields .= 's.attemptnumber as attemptnumber, ';
142         $fields .= 'g.id as gradeid, ';
143         $fields .= 'g.grade as grade, ';
144         $fields .= 'g.timemodified as timemarked, ';
145         $fields .= 'g.timecreated as firstmarked, ';
146         $fields .= 'uf.mailed as mailed, ';
147         $fields .= 'uf.locked as locked, ';
148         $fields .= 'uf.extensionduedate as extensionduedate, ';
149         $fields .= 'uf.workflowstate as workflowstate, ';
150         $fields .= 'uf.allocatedmarker as allocatedmarker ';
152         $from = '{user} u
153                          LEFT JOIN {assign_submission} s ON
154                             u.id = s.userid AND
155                             s.assignment = :assignmentid1 AND
156                             s.latest = 1
157                          LEFT JOIN {assign_grades} g ON
158                             u.id = g.userid AND
159                             g.assignment = :assignmentid2 AND
160                             g.attemptnumber = s.attemptnumber
161                          LEFT JOIN {assign_user_flags} uf ON u.id = uf.userid AND uf.assignment = :assignmentid3';
163         $userparams = array();
164         $userindex = 0;
166         list($userwhere, $userparams) = $DB->get_in_or_equal($users, SQL_PARAMS_NAMED, 'user');
167         $where = 'u.id ' . $userwhere;
168         $params = array_merge($params, $userparams);
170         // The filters do not make sense when there are no submissions, so do not apply them.
171         if ($this->assignment->is_any_submission_plugin_enabled()) {
172             if ($filter == ASSIGN_FILTER_SUBMITTED) {
173                 $where .= ' AND (s.timemodified IS NOT NULL AND
174                                  s.status = :submitted) ';
175                 $params['submitted'] = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
177             } else if ($filter == ASSIGN_FILTER_NOT_SUBMITTED) {
178                 $where .= ' AND (s.timemodified IS NULL OR s.status != :submitted) ';
179                 $params['submitted'] = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
180             } else if ($filter == ASSIGN_FILTER_REQUIRE_GRADING) {
181                 $where .= ' AND (s.timemodified IS NOT NULL AND
182                                  s.status = :submitted AND
183                                  (s.timemodified > g.timemodified OR g.timemodified IS NULL))';
184                 $params['submitted'] = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
186             } else if (strpos($filter, ASSIGN_FILTER_SINGLE_USER) === 0) {
187                 $userfilter = (int) array_pop(explode('=', $filter));
188                 $where .= ' AND (u.id = :userid)';
189                 $params['userid'] = $userfilter;
190             }
191         }
193         if ($this->assignment->get_instance()->markingworkflow &&
194             $this->assignment->get_instance()->markingallocation) {
195             if (has_capability('mod/assign:manageallocations', $this->assignment->get_context())) {
196                 // Check to see if marker filter is set.
197                 $markerfilter = (int)get_user_preferences('assign_markerfilter', '');
198                 if (!empty($markerfilter)) {
199                     if ($markerfilter == ASSIGN_MARKER_FILTER_NO_MARKER) {
200                         $where .= ' AND (uf.allocatedmarker IS NULL OR uf.allocatedmarker = 0)';
201                     } else {
202                         $where .= ' AND uf.allocatedmarker = :markerid';
203                         $params['markerid'] = $markerfilter;
204                     }
205                 }
206             } else { // Only show users allocated to this marker.
207                 $where .= ' AND uf.allocatedmarker = :markerid';
208                 $params['markerid'] = $USER->id;
209             }
210         }
212         if ($this->assignment->get_instance()->markingworkflow) {
213             $workflowstates = $this->assignment->get_marking_workflow_states_for_current_user();
214             if (!empty($workflowstates)) {
215                 $workflowfilter = get_user_preferences('assign_workflowfilter', '');
216                 if ($workflowfilter == ASSIGN_MARKING_WORKFLOW_STATE_NOTMARKED) {
217                     $where .= ' AND (uf.workflowstate = :workflowstate OR uf.workflowstate IS NULL OR '.
218                         $DB->sql_isempty('assign_user_flags', 'workflowstate', true, true).')';
219                     $params['workflowstate'] = $workflowfilter;
220                 } else if (array_key_exists($workflowfilter, $workflowstates)) {
221                     $where .= ' AND uf.workflowstate = :workflowstate';
222                     $params['workflowstate'] = $workflowfilter;
223                 }
224             }
225         }
227         $this->set_sql($fields, $from, $where, $params);
229         if ($downloadfilename) {
230             $this->is_downloading('csv', $downloadfilename);
231         }
233         $columns = array();
234         $headers = array();
236         // Select.
237         if (!$this->is_downloading() && $this->hasgrade) {
238             $columns[] = 'select';
239             $headers[] = get_string('select') .
240                     '<div class="selectall"><label class="accesshide" for="selectall">' . get_string('selectall') . '</label>
241                     <input type="checkbox" id="selectall" name="selectall" title="' . get_string('selectall') . '"/></div>';
242         }
244         // User picture.
245         if ($this->hasviewblind || !$this->assignment->is_blind_marking()) {
246             if (!$this->is_downloading()) {
247                 $columns[] = 'picture';
248                 $headers[] = get_string('pictureofuser');
249             } else {
250                 $columns[] = 'recordid';
251                 $headers[] = get_string('recordid', 'assign');
252             }
254             // Fullname.
255             $columns[] = 'fullname';
256             $headers[] = get_string('fullname');
258             foreach ($extrauserfields as $extrafield) {
259                 $columns[] = $extrafield;
260                 $headers[] = get_user_field_name($extrafield);
261             }
262         } else {
263             // Record ID.
264             $columns[] = 'recordid';
265             $headers[] = get_string('recordid', 'assign');
266         }
268         // Submission status.
269         if ($assignment->is_any_submission_plugin_enabled()) {
270             $columns[] = 'status';
271             $headers[] = get_string('status', 'assign');
272         } else if ($this->assignment->get_instance()->markingworkflow) {
273             $columns[] = 'workflowstatus';
274             $headers[] = get_string('status', 'assign');
275         }
277         // Team submission columns.
278         if ($assignment->get_instance()->teamsubmission) {
279             $columns[] = 'team';
280             $headers[] = get_string('submissionteam', 'assign');
281         }
282         // Allocated marker.
283         if ($this->assignment->get_instance()->markingworkflow &&
284             $this->assignment->get_instance()->markingallocation &&
285             has_capability('mod/assign:manageallocations', $this->assignment->get_context())) {
286             // Add a column for the allocated marker.
287             $columns[] = 'allocatedmarker';
288             $headers[] = get_string('marker', 'assign');
289         }
290         // Grade.
291         $columns[] = 'grade';
292         $headers[] = get_string('grade');
293         if ($this->is_downloading()) {
294             if ($this->assignment->get_instance()->grade >= 0) {
295                 $columns[] = 'grademax';
296                 $headers[] = get_string('maxgrade', 'assign');
297             } else {
298                 // This is a custom scale.
299                 $columns[] = 'scale';
300                 $headers[] = get_string('scale', 'assign');
301             }
303             if ($this->assignment->get_instance()->markingworkflow) {
304                 // Add a column for the marking workflow state.
305                 $columns[] = 'workflowstate';
306                 $headers[] = get_string('markingworkflowstate', 'assign');
307             }
308             // Add a column for the list of valid marking workflow states.
309             $columns[] = 'gradecanbechanged';
310             $headers[] = get_string('gradecanbechanged', 'assign');
311         }
312         if (!$this->is_downloading() && $this->hasgrade) {
313             // We have to call this column userid so we can use userid as a default sortable column.
314             $columns[] = 'userid';
315             $headers[] = get_string('edit');
316         }
318         // Submission plugins.
319         if ($assignment->is_any_submission_plugin_enabled()) {
320             $columns[] = 'timesubmitted';
321             $headers[] = get_string('lastmodifiedsubmission', 'assign');
323             foreach ($this->assignment->get_submission_plugins() as $plugin) {
324                 if ($this->is_downloading()) {
325                     if ($plugin->is_visible() && $plugin->is_enabled()) {
326                         foreach ($plugin->get_editor_fields() as $field => $description) {
327                             $index = 'plugin' . count($this->plugincache);
328                             $this->plugincache[$index] = array($plugin, $field);
329                             $columns[] = $index;
330                             $headers[] = $plugin->get_name();
331                         }
332                     }
333                 } else {
334                     if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
335                         $index = 'plugin' . count($this->plugincache);
336                         $this->plugincache[$index] = array($plugin);
337                         $columns[] = $index;
338                         $headers[] = $plugin->get_name();
339                     }
340                 }
341             }
342         }
344         // Time marked.
345         $columns[] = 'timemarked';
346         $headers[] = get_string('lastmodifiedgrade', 'assign');
348         // Feedback plugins.
349         foreach ($this->assignment->get_feedback_plugins() as $plugin) {
350             if ($this->is_downloading()) {
351                 if ($plugin->is_visible() && $plugin->is_enabled()) {
352                     foreach ($plugin->get_editor_fields() as $field => $description) {
353                         $index = 'plugin' . count($this->plugincache);
354                         $this->plugincache[$index] = array($plugin, $field);
355                         $columns[] = $index;
356                         $headers[] = $description;
357                     }
358                 }
359             } else if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
360                 $index = 'plugin' . count($this->plugincache);
361                 $this->plugincache[$index] = array($plugin);
362                 $columns[] = $index;
363                 $headers[] = $plugin->get_name();
364             }
365         }
367         // Exclude 'Final grade' column in downloaded grading worksheets.
368         if (!$this->is_downloading()) {
369             // Final grade.
370             $columns[] = 'finalgrade';
371             $headers[] = get_string('finalgrade', 'grades');
372         }
374         // Load the grading info for all users.
375         $this->gradinginfo = grade_get_grades($this->assignment->get_course()->id,
376                                               'mod',
377                                               'assign',
378                                               $this->assignment->get_instance()->id,
379                                               $users);
381         if (!empty($CFG->enableoutcomes) && !empty($this->gradinginfo->outcomes)) {
382             $columns[] = 'outcomes';
383             $headers[] = get_string('outcomes', 'grades');
384         }
386         // Set the columns.
387         $this->define_columns($columns);
388         $this->define_headers($headers);
389         foreach ($extrauserfields as $extrafield) {
390              $this->column_class($extrafield, $extrafield);
391         }
392         // We require at least one unique column for the sort.
393         $this->sortable(true, 'userid');
394         $this->no_sorting('recordid');
395         $this->no_sorting('finalgrade');
396         $this->no_sorting('userid');
397         $this->no_sorting('select');
398         $this->no_sorting('outcomes');
400         if ($assignment->get_instance()->teamsubmission) {
401             $this->no_sorting('team');
402         }
404         $plugincolumnindex = 0;
405         foreach ($this->assignment->get_submission_plugins() as $plugin) {
406             if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
407                 $submissionpluginindex = 'plugin' . $plugincolumnindex++;
408                 $this->no_sorting($submissionpluginindex);
409             }
410         }
411         foreach ($this->assignment->get_feedback_plugins() as $plugin) {
412             if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
413                 $feedbackpluginindex = 'plugin' . $plugincolumnindex++;
414                 $this->no_sorting($feedbackpluginindex);
415             }
416         }
418         // When there is no data we still want the column headers printed in the csv file.
419         if ($this->is_downloading()) {
420             $this->start_output();
421         }
422     }
424     /**
425      * Before adding each row to the table make sure rownum is incremented.
426      *
427      * @param array $row row of data from db used to make one row of the table.
428      * @return array one row for the table
429      */
430     public function format_row($row) {
431         if ($this->rownum < 0) {
432             $this->rownum = $this->currpage * $this->pagesize;
433         } else {
434             $this->rownum += 1;
435         }
437         return parent::format_row($row);
438     }
440     /**
441      * Add a column with an ID that uniquely identifies this user in this assignment.
442      *
443      * @param stdClass $row
444      * @return string
445      */
446     public function col_recordid(stdClass $row) {
447         return get_string('hiddenuser', 'assign') .
448                $this->assignment->get_uniqueid_for_user($row->userid);
449     }
452     /**
453      * Add the userid to the row class so it can be updated via ajax.
454      *
455      * @param stdClass $row The row of data
456      * @return string The row class
457      */
458     public function get_row_class($row) {
459         return 'user' . $row->userid;
460     }
462     /**
463      * Return the number of rows to display on a single page.
464      *
465      * @return int The number of rows per page
466      */
467     public function get_rows_per_page() {
468         return $this->perpage;
469     }
471     /**
472      * list current marking workflow state
473      *
474      * @param stdClass $row
475      * @return string
476      */
477     public function col_workflowstatus(stdClass $row) {
478         $o = '';
480         $gradingdisabled = $this->assignment->grading_disabled($row->id);
481         // The function in the assignment keeps a static cache of this list of states.
482         $workflowstates = $this->assignment->get_marking_workflow_states_for_current_user();
483         $workflowstate = $row->workflowstate;
484         if (empty($workflowstate)) {
485             $workflowstate = ASSIGN_MARKING_WORKFLOW_STATE_NOTMARKED;
486         }
487         if ($this->quickgrading && !$gradingdisabled) {
488             $notmarked = get_string('markingworkflowstatenotmarked', 'assign');
489             $name = 'quickgrade_' . $row->id . '_workflowstate';
490             $o .= html_writer::select($workflowstates, $name, $workflowstate, array('' => $notmarked));
491             // Check if this user is a marker that can't manage allocations and doesn't have the marker column added.
492             if ($this->assignment->get_instance()->markingworkflow &&
493                 $this->assignment->get_instance()->markingallocation &&
494                 !has_capability('mod/assign:manageallocations', $this->assignment->get_context())) {
496                 $name = 'quickgrade_' . $row->id . '_allocatedmarker';
497                 $o .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => $name,
498                         'value' => $row->allocatedmarker));
499             }
500         } else {
501             $o .= $this->output->container(get_string('markingworkflowstate' . $workflowstate, 'assign'), $workflowstate);
502         }
503         return $o;
504     }
506     /**
507      * For download only - list current marking workflow state
508      *
509      * @param stdClass $row - The row of data
510      * @return string The current marking workflow state
511      */
512     public function col_workflowstate($row) {
513         $state = $row->workflowstate;
514         if (empty($state)) {
515             $state = ASSIGN_MARKING_WORKFLOW_STATE_NOTMARKED;
516         }
518         return get_string('markingworkflowstate' . $state, 'assign');
519     }
521     /**
522      * list current marker
523      *
524      * @param stdClass $row - The row of data
525      * @return id the user->id of the marker.
526      */
527     public function col_allocatedmarker(stdClass $row) {
528         static $markers = null;
529         static $markerlist = array();
530         if ($markers === null) {
531             $markers = get_users_by_capability($this->assignment->get_context(), 'mod/assign:grade');
532             $markerlist[0] = get_string('choosemarker', 'assign');
533             foreach ($markers as $marker) {
534                 $markerlist[$marker->id] = fullname($marker);
535             }
536         }
537         if (empty($markerlist)) {
538             // TODO: add some form of notification here that no markers are available.
539             return '';
540         }
541         if ($this->is_downloading()) {
542             if (isset($markers[$row->allocatedmarker])) {
543                 return fullname($markers[$row->allocatedmarker]);
544             } else {
545                 return '';
546             }
547         }
549         if ($this->quickgrading && has_capability('mod/assign:manageallocations', $this->assignment->get_context()) &&
550             (empty($row->workflowstate) ||
551              $row->workflowstate == ASSIGN_MARKING_WORKFLOW_STATE_INMARKING ||
552              $row->workflowstate == ASSIGN_MARKING_WORKFLOW_STATE_NOTMARKED)) {
554             $name = 'quickgrade_' . $row->id . '_allocatedmarker';
555             return  html_writer::select($markerlist, $name, $row->allocatedmarker, false);
556         } else if (!empty($row->allocatedmarker)) {
557             $output = '';
558             if ($this->quickgrading) { // Add hidden field for quickgrading page.
559                 $name = 'quickgrade_' . $row->id . '_allocatedmarker';
560                 $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>$name, 'value'=>$row->allocatedmarker));
561             }
562             $output .= $markerlist[$row->allocatedmarker];
563             return $output;
564         }
565     }
566     /**
567      * For download only - list all the valid options for this custom scale.
568      *
569      * @param stdClass $row - The row of data
570      * @return string A list of valid options for the current scale
571      */
572     public function col_scale($row) {
573         global $DB;
575         if (empty($this->scale)) {
576             $dbparams = array('id'=>-($this->assignment->get_instance()->grade));
577             $this->scale = $DB->get_record('scale', $dbparams);
578         }
580         if (!empty($this->scale->scale)) {
581             return implode("\n", explode(',', $this->scale->scale));
582         }
583         return '';
584     }
586     /**
587      * Display a grade with scales etc.
588      *
589      * @param string $grade
590      * @param boolean $editable
591      * @param int $userid The user id of the user this grade belongs to
592      * @param int $modified Timestamp showing when the grade was last modified
593      * @return string The formatted grade
594      */
595     public function display_grade($grade, $editable, $userid, $modified) {
596         if ($this->is_downloading()) {
597             if ($this->assignment->get_instance()->grade >= 0) {
598                 if ($grade == -1 || $grade === null) {
599                     return '';
600                 }
601                 return format_float($grade, 2);
602             } else {
603                 // This is a custom scale.
604                 $scale = $this->assignment->display_grade($grade, false);
605                 if ($scale == '-') {
606                     $scale = '';
607                 }
608                 return $scale;
609             }
610         }
611         return $this->assignment->display_grade($grade, $editable, $userid, $modified);
612     }
614     /**
615      * Get the team info for this user.
616      *
617      * @param stdClass $row
618      * @return string The team name
619      */
620     public function col_team(stdClass $row) {
621         $submission = false;
622         $group = false;
623         $this->get_group_and_submission($row->id, $group, $submission, -1);
624         if ($group) {
625             return $group->name;
626         }
627         return get_string('defaultteam', 'assign');
628     }
630     /**
631      * Use a static cache to try and reduce DB calls.
632      *
633      * @param int $userid The user id for this submission
634      * @param int $group The groupid (returned)
635      * @param stdClass|false $submission The stdClass submission or false (returned)
636      * @param int $attemptnumber Return a specific attempt number (-1 for latest)
637      */
638     protected function get_group_and_submission($userid, &$group, &$submission, $attemptnumber) {
639         $group = false;
640         if (isset($this->submissiongroups[$userid])) {
641             $group = $this->submissiongroups[$userid];
642         } else {
643             $group = $this->assignment->get_submission_group($userid, false);
644             $this->submissiongroups[$userid] = $group;
645         }
647         $groupid = 0;
648         if ($group) {
649             $groupid = $group->id;
650         }
652         // Static cache is keyed by groupid and attemptnumber.
653         // We may need both the latest and previous attempt in the same page.
654         if (isset($this->groupsubmissions[$groupid . ':' . $attemptnumber])) {
655             $submission = $this->groupsubmissions[$groupid . ':' . $attemptnumber];
656         } else {
657             $submission = $this->assignment->get_group_submission($userid, $groupid, false, $attemptnumber);
658             $this->groupsubmissions[$groupid . ':' . $attemptnumber] = $submission;
659         }
660     }
662     /**
663      * Format a list of outcomes.
664      *
665      * @param stdClass $row
666      * @return string
667      */
668     public function col_outcomes(stdClass $row) {
669         $outcomes = '';
670         foreach ($this->gradinginfo->outcomes as $index => $outcome) {
671             $options = make_grades_menu(-$outcome->scaleid);
673             $options[0] = get_string('nooutcome', 'grades');
674             if ($this->quickgrading && !($outcome->grades[$row->userid]->locked)) {
675                 $select = '<select name="outcome_' . $index . '_' . $row->userid . '" class="quickgrade">';
676                 foreach ($options as $optionindex => $optionvalue) {
677                     $selected = '';
678                     if ($outcome->grades[$row->userid]->grade == $optionindex) {
679                         $selected = 'selected="selected"';
680                     }
681                     $select .= '<option value="' . $optionindex . '"' . $selected . '>' . $optionvalue . '</option>';
682                 }
683                 $select .= '</select>';
684                 $outcomes .= $this->output->container($outcome->name . ': ' . $select, 'outcome');
685             } else {
686                 $name = $outcome->name . ': ' . $options[$outcome->grades[$row->userid]->grade];
687                 if ($this->is_downloading()) {
688                     $outcomes .= $name;
689                 } else {
690                     $outcomes .= $this->output->container($name, 'outcome');
691                 }
692             }
693         }
695         return $outcomes;
696     }
699     /**
700      * Format a user picture for display.
701      *
702      * @param stdClass $row
703      * @return string
704      */
705     public function col_picture(stdClass $row) {
706         if ($row->picture) {
707             return $this->output->user_picture($row);
708         }
709         return '';
710     }
712     /**
713      * Format a user record for display (link to profile).
714      *
715      * @param stdClass $row
716      * @return string
717      */
718     public function col_fullname($row) {
719         if (!$this->is_downloading()) {
720             $courseid = $this->assignment->get_course()->id;
721             $link= new moodle_url('/user/view.php', array('id' =>$row->id, 'course'=>$courseid));
722             $fullname = $this->output->action_link($link, $this->assignment->fullname($row));
723         } else {
724             $fullname = $this->assignment->fullname($row);
725         }
727         if (!$this->assignment->is_active_user($row->id)) {
728             $suspendedstring = get_string('userenrolmentsuspended', 'grades');
729             $fullname .= ' ' . html_writer::empty_tag('img', array('src' => $this->output->pix_url('i/enrolmentsuspended'),
730                 'title' => $suspendedstring, 'alt' => $suspendedstring, 'class' => 'usersuspendedicon'));
731             $fullname = html_writer::tag('span', $fullname, array('class' => 'usersuspended'));
732         }
733         return $fullname;
734     }
736     /**
737      * Insert a checkbox for selecting the current row for batch operations.
738      *
739      * @param stdClass $row
740      * @return string
741      */
742     public function col_select(stdClass $row) {
743         $selectcol = '<label class="accesshide" for="selectuser_' . $row->userid . '">';
744         $selectcol .= get_string('selectuser', 'assign', $this->assignment->fullname($row));
745         $selectcol .= '</label>';
746         $selectcol .= '<input type="checkbox"
747                               id="selectuser_' . $row->userid . '"
748                               name="selectedusers"
749                               value="' . $row->userid . '"/>';
750         $selectcol .= '<input type="hidden"
751                               name="grademodified_' . $row->userid . '"
752                               value="' . $row->timemarked . '"/>';
753         return $selectcol;
754     }
756     /**
757      * Return a users grades from the listing of all grade data for this assignment.
758      *
759      * @param int $userid
760      * @return mixed stdClass or false
761      */
762     private function get_gradebook_data_for_user($userid) {
763         if (isset($this->gradinginfo->items[0]) && $this->gradinginfo->items[0]->grades[$userid]) {
764             return $this->gradinginfo->items[0]->grades[$userid];
765         }
766         return false;
767     }
769     /**
770      * Format a column of data for display.
771      *
772      * @param stdClass $row
773      * @return string
774      */
775     public function col_gradecanbechanged(stdClass $row) {
776         $gradingdisabled = $this->assignment->grading_disabled($row->id);
777         if ($gradingdisabled) {
778             return get_string('no');
779         } else {
780             return get_string('yes');
781         }
782     }
784     /**
785      * Format a column of data for display
786      *
787      * @param stdClass $row
788      * @return string
789      */
790     public function col_grademax(stdClass $row) {
791         return format_float($this->assignment->get_instance()->grade, 2);
792     }
794     /**
795      * Format a column of data for display.
796      *
797      * @param stdClass $row
798      * @return string
799      */
800     public function col_grade(stdClass $row) {
801         $o = '';
803         $link = '';
804         $separator = $this->output->spacer(array(), true);
805         $grade = '';
806         $gradingdisabled = $this->assignment->grading_disabled($row->id);
808         if (!$this->is_downloading() && $this->hasgrade) {
809             $name = $this->assignment->fullname($row);
810             $icon = $this->output->pix_icon('gradefeedback',
811                                             get_string('gradeuser', 'assign', $name),
812                                             'mod_assign');
813             $urlparams = array('id' => $this->assignment->get_course_module()->id,
814                                'rownum'=>$this->rownum,
815                                'action'=>'grade');
816             $url = new moodle_url('/mod/assign/view.php', $urlparams);
817             $link = $this->output->action_link($url, $icon);
818             $grade .= $link . $separator;
819         }
821         $grade .= $this->display_grade($row->grade,
822                                        $this->quickgrading && !$gradingdisabled,
823                                        $row->userid,
824                                        $row->timemarked);
826         return $grade;
827     }
829     /**
830      * Format a column of data for display.
831      *
832      * @param stdClass $row
833      * @return string
834      */
835     public function col_finalgrade(stdClass $row) {
836         $o = '';
838         $grade = $this->get_gradebook_data_for_user($row->userid);
839         if ($grade) {
840             $o = $this->display_grade($grade->grade, false, $row->userid, $row->timemarked);
841         }
843         return $o;
844     }
846     /**
847      * Format a column of data for display.
848      *
849      * @param stdClass $row
850      * @return string
851      */
852     public function col_timemarked(stdClass $row) {
853         $o = '-';
855         if ($row->timemarked && $row->grade !== null && $row->grade >= 0) {
856             $o = userdate($row->timemarked);
857         }
858         if ($row->timemarked && $this->is_downloading()) {
859             // Force it for downloads as it affects import.
860             $o = userdate($row->timemarked);
861         }
863         return $o;
864     }
866     /**
867      * Format a column of data for display.
868      *
869      * @param stdClass $row
870      * @return string
871      */
872     public function col_timesubmitted(stdClass $row) {
873         $o = '-';
875         $group = false;
876         $submission = false;
877         $this->get_group_and_submission($row->id, $group, $submission, -1);
878         if ($group && $submission && $submission->timemodified) {
879             $o = userdate($submission->timemodified);
880         } else if ($row->timesubmitted) {
881             $o = userdate($row->timesubmitted);
882         }
884         return $o;
885     }
887     /**
888      * Format a column of data for display
889      *
890      * @param stdClass $row
891      * @return string
892      */
893     public function col_status(stdClass $row) {
894         $o = '';
896         $instance = $this->assignment->get_instance();
898         $due = $instance->duedate;
899         if ($row->extensionduedate) {
900             $due = $row->extensionduedate;
901         }
903         $group = false;
904         $submission = false;
905         $this->get_group_and_submission($row->id, $group, $submission, -1);
906         if ($group && $submission) {
907             $timesubmitted = $submission->timemodified;
908             $status = $submission->status;
909         } else {
910             $timesubmitted = $row->timesubmitted;
911             $status = $row->status;
912         }
914         if ($this->assignment->is_any_submission_plugin_enabled()) {
916             $o .= $this->output->container(get_string('submissionstatus_' . $status, 'assign'),
917                                            array('class'=>'submissionstatus' .$status));
918             if ($due && $timesubmitted > $due) {
919                 $usertime = format_time($timesubmitted - $due);
920                 $latemessage = get_string('submittedlateshort',
921                                           'assign',
922                                           $usertime);
923                 $o .= $this->output->container($latemessage, 'latesubmission');
924             }
925             if ($row->locked) {
926                 $lockedstr = get_string('submissionslockedshort', 'assign');
927                 $o .= $this->output->container($lockedstr, 'lockedsubmission');
928             }
930             // Add status of "grading", use markflow if enabled.
931             if ($instance->markingworkflow) {
932                 $o .= $this->col_workflowstatus($row);
933             } else if ($row->grade !== null && $row->grade >= 0) {
934                 $o .= $this->output->container(get_string('graded', 'assign'), 'submissiongraded');
935             } else if (!$timesubmitted) {
936                 $now = time();
937                 if ($due && ($now > $due)) {
938                     $overduestr = get_string('overdue', 'assign', format_time($now - $due));
939                     $o .= $this->output->container($overduestr, 'overduesubmission');
940                 }
941             }
943             if ($row->extensionduedate) {
944                 $userdate = userdate($row->extensionduedate);
945                 $extensionstr = get_string('userextensiondate', 'assign', $userdate);
946                 $o .= $this->output->container($extensionstr, 'extensiondate');
947             }
948         }
950         if ($this->is_downloading()) {
951             $o = strip_tags(str_replace('</div>', "\n", $o));
952         }
954         return $o;
955     }
957     /**
958      * Format a column of data for display.
959      *
960      * @param stdClass $row
961      * @return string
962      */
963     public function col_userid(stdClass $row) {
964         global $USER;
966         $edit = '';
968         $actions = array();
970         $urlparams = array('id'=>$this->assignment->get_course_module()->id,
971                            'rownum'=>$this->rownum,
972                            'action'=>'grade');
973         $url = new moodle_url('/mod/assign/view.php', $urlparams);
974         $noimage = null;
976         if (!$row->grade) {
977             $description = get_string('grade');
978         } else {
979             $description = get_string('updategrade', 'assign');
980         }
981         $actions['grade'] = new action_menu_link_secondary(
982             $url,
983             $noimage,
984             $description
985         );
987         // Everything we need is in the row.
988         $submission = $row;
989         $flags = $row;
990         if ($this->assignment->get_instance()->teamsubmission) {
991             // Use the cache for this.
992             $submission = false;
993             $group = false;
994             $this->get_group_and_submission($row->id, $group, $submission, -1);
995         }
997         $submissionsopen = $this->assignment->submissions_open($row->id,
998                                                                true,
999                                                                $submission,
1000                                                                $flags,
1001                                                                $this->gradinginfo);
1002         $caneditsubmission = $this->assignment->can_edit_submission($row->id, $USER->id);
1004         // Hide for offline assignments.
1005         if ($this->assignment->is_any_submission_plugin_enabled()) {
1006             if (!$row->status ||
1007                     $row->status == ASSIGN_SUBMISSION_STATUS_DRAFT ||
1008                     !$this->assignment->get_instance()->submissiondrafts) {
1010                 if (!$row->locked) {
1011                     $urlparams = array('id' => $this->assignment->get_course_module()->id,
1012                                        'userid'=>$row->id,
1013                                        'action'=>'lock',
1014                                        'sesskey'=>sesskey(),
1015                                        'page'=>$this->currpage);
1016                     $url = new moodle_url('/mod/assign/view.php', $urlparams);
1018                     $description = get_string('preventsubmissionsshort', 'assign');
1019                     $actions['lock'] = new action_menu_link_secondary(
1020                         $url,
1021                         $noimage,
1022                         $description
1023                     );
1024                 } else {
1025                     $urlparams = array('id' => $this->assignment->get_course_module()->id,
1026                                        'userid'=>$row->id,
1027                                        'action'=>'unlock',
1028                                        'sesskey'=>sesskey(),
1029                                        'page'=>$this->currpage);
1030                     $url = new moodle_url('/mod/assign/view.php', $urlparams);
1031                     $description = get_string('allowsubmissionsshort', 'assign');
1032                     $actions['unlock'] = new action_menu_link_secondary(
1033                         $url,
1034                         $noimage,
1035                         $description
1036                     );
1037                 }
1038             }
1040             if (($this->assignment->get_instance()->duedate ||
1041                    $this->assignment->get_instance()->cutoffdate) &&
1042                    $this->hasgrantextension) {
1043                 $urlparams = array('id' => $this->assignment->get_course_module()->id,
1044                                    'userid'=>$row->id,
1045                                    'action'=>'grantextension',
1046                                    'sesskey'=>sesskey(),
1047                                    'page'=>$this->currpage);
1048                 $url = new moodle_url('/mod/assign/view.php', $urlparams);
1049                 $description = get_string('grantextension', 'assign');
1050                 $actions['grantextension'] = new action_menu_link_secondary(
1051                     $url,
1052                     $noimage,
1053                     $description
1054                 );
1055             }
1056             if ($submissionsopen &&
1057                     $USER->id != $row->id &&
1058                     $caneditsubmission) {
1059                 $urlparams = array('id' => $this->assignment->get_course_module()->id,
1060                                    'userid'=>$row->id,
1061                                    'action'=>'editsubmission',
1062                                    'sesskey'=>sesskey(),
1063                                    'page'=>$this->currpage);
1064                 $url = new moodle_url('/mod/assign/view.php', $urlparams);
1065                 $description = get_string('editsubmission', 'assign');
1066                 $actions['editsubmission'] = new action_menu_link_secondary(
1067                     $url,
1068                     $noimage,
1069                     $description
1070                 );
1071             }
1072         }
1073         if ($row->status == ASSIGN_SUBMISSION_STATUS_SUBMITTED &&
1074                 $this->assignment->get_instance()->submissiondrafts) {
1075             $urlparams = array('id' => $this->assignment->get_course_module()->id,
1076                                'userid'=>$row->id,
1077                                'action'=>'reverttodraft',
1078                                'sesskey'=>sesskey(),
1079                                'page'=>$this->currpage);
1080             $url = new moodle_url('/mod/assign/view.php', $urlparams);
1081             $description = get_string('reverttodraftshort', 'assign');
1082             $actions['reverttodraft'] = new action_menu_link_secondary(
1083                 $url,
1084                 $noimage,
1085                 $description
1086             );
1087         }
1088         if ($row->status == ASSIGN_SUBMISSION_STATUS_DRAFT &&
1089                 $this->assignment->get_instance()->submissiondrafts &&
1090                 $caneditsubmission &&
1091                 $submissionsopen &&
1092                 $row->id != $USER->id) {
1093             $urlparams = array('id' => $this->assignment->get_course_module()->id,
1094                                'userid'=>$row->id,
1095                                'action'=>'submitotherforgrading',
1096                                'sesskey'=>sesskey(),
1097                                'page'=>$this->currpage);
1098             $url = new moodle_url('/mod/assign/view.php', $urlparams);
1099             $description = get_string('submitforgrading', 'assign');
1100             $actions['submitforgrading'] = new action_menu_link_secondary(
1101                 $url,
1102                 $noimage,
1103                 $description
1104             );
1105         }
1107         $ismanual = $this->assignment->get_instance()->attemptreopenmethod == ASSIGN_ATTEMPT_REOPEN_METHOD_MANUAL;
1108         $hassubmission = !empty($row->status);
1109         $notreopened = $hassubmission && $row->status != ASSIGN_SUBMISSION_STATUS_REOPENED;
1110         $isunlimited = $this->assignment->get_instance()->maxattempts == ASSIGN_UNLIMITED_ATTEMPTS;
1111         $hasattempts = $isunlimited || $row->attemptnumber < $this->assignment->get_instance()->maxattempts - 1;
1113         if ($ismanual && $hassubmission && $notreopened && $hasattempts) {
1114             $urlparams = array('id' => $this->assignment->get_course_module()->id,
1115                                'userid'=>$row->id,
1116                                'action'=>'addattempt',
1117                                'sesskey'=>sesskey(),
1118                                'page'=>$this->currpage);
1119             $url = new moodle_url('/mod/assign/view.php', $urlparams);
1120             $description = get_string('addattempt', 'assign');
1121             $actions['addattempt'] = new action_menu_link_secondary(
1122                 $url,
1123                 $noimage,
1124                 $description
1125             );
1126         }
1128         $menu = new action_menu();
1129         $menu->set_owner_selector('.gradingtable-actionmenu');
1130         $menu->set_alignment(action_menu::TL, action_menu::BL);
1131         $menu->set_constraint('.gradingtable > .no-overflow');
1132         $menu->set_menu_trigger(get_string('edit'));
1133         foreach ($actions as $action) {
1134             $menu->add($action);
1135         }
1137         // Prioritise the menu ahead of all other actions.
1138         $menu->prioritise = true;
1140         $edit .= $this->output->render($menu);
1142         return $edit;
1143     }
1145     /**
1146      * Write the plugin summary with an optional link to view the full feedback/submission.
1147      *
1148      * @param assign_plugin $plugin Submission plugin or feedback plugin
1149      * @param stdClass $item Submission or grade
1150      * @param string $returnaction The return action to pass to the
1151      *                             view_submission page (the current page)
1152      * @param string $returnparams The return params to pass to the view_submission
1153      *                             page (the current page)
1154      * @return string The summary with an optional link
1155      */
1156     private function format_plugin_summary_with_link(assign_plugin $plugin,
1157                                                      stdClass $item,
1158                                                      $returnaction,
1159                                                      $returnparams) {
1160         $link = '';
1161         $showviewlink = false;
1163         $summary = $plugin->view_summary($item, $showviewlink);
1164         $separator = '';
1165         if ($showviewlink) {
1166             $viewstr = get_string('view' . substr($plugin->get_subtype(), strlen('assign')), 'assign');
1167             $icon = $this->output->pix_icon('t/preview', $viewstr);
1168             $urlparams = array('id' => $this->assignment->get_course_module()->id,
1169                                                      'sid'=>$item->id,
1170                                                      'gid'=>$item->id,
1171                                                      'plugin'=>$plugin->get_type(),
1172                                                      'action'=>'viewplugin' . $plugin->get_subtype(),
1173                                                      'returnaction'=>$returnaction,
1174                                                      'returnparams'=>http_build_query($returnparams));
1175             $url = new moodle_url('/mod/assign/view.php', $urlparams);
1176             $link = $this->output->action_link($url, $icon);
1177             $separator = $this->output->spacer(array(), true);
1178         }
1180         return $link . $separator . $summary;
1181     }
1184     /**
1185      * Format the submission and feedback columns.
1186      *
1187      * @param string $colname The column name
1188      * @param stdClass $row The submission row
1189      * @return mixed string or NULL
1190      */
1191     public function other_cols($colname, $row) {
1192         // For extra user fields the result is already in $row.
1193         if (empty($this->plugincache[$colname])) {
1194             return $row->$colname;
1195         }
1197         // This must be a plugin field.
1198         $plugincache = $this->plugincache[$colname];
1200         $plugin = $plugincache[0];
1202         $field = null;
1203         if (isset($plugincache[1])) {
1204             $field = $plugincache[1];
1205         }
1207         if ($plugin->is_visible() && $plugin->is_enabled()) {
1208             if ($plugin->get_subtype() == 'assignsubmission') {
1209                 if ($this->assignment->get_instance()->teamsubmission) {
1210                     $group = false;
1211                     $submission = false;
1213                     $this->get_group_and_submission($row->id, $group, $submission, -1);
1214                     if ($submission) {
1215                         if ($submission->status == ASSIGN_SUBMISSION_STATUS_REOPENED) {
1216                             // For a newly reopened submission - we want to show the previous submission in the table.
1217                             $this->get_group_and_submission($row->id, $group, $submission, $submission->attemptnumber-1);
1218                         }
1219                         if (isset($field)) {
1220                             return $plugin->get_editor_text($field, $submission->id);
1221                         }
1222                         return $this->format_plugin_summary_with_link($plugin,
1223                                                                       $submission,
1224                                                                       'grading',
1225                                                                       array());
1226                     }
1227                 } else if ($row->submissionid) {
1228                     if ($row->status == ASSIGN_SUBMISSION_STATUS_REOPENED) {
1229                         // For a newly reopened submission - we want to show the previous submission in the table.
1230                         $submission = $this->assignment->get_user_submission($row->userid, false, $row->attemptnumber - 1);
1231                     } else {
1232                         $submission = new stdClass();
1233                         $submission->id = $row->submissionid;
1234                         $submission->timecreated = $row->firstsubmission;
1235                         $submission->timemodified = $row->timesubmitted;
1236                         $submission->assignment = $this->assignment->get_instance()->id;
1237                         $submission->userid = $row->userid;
1238                         $submission->attemptnumber = $row->attemptnumber;
1239                     }
1240                     // Field is used for only for import/export and refers the the fieldname for the text editor.
1241                     if (isset($field)) {
1242                         return $plugin->get_editor_text($field, $submission->id);
1243                     }
1244                     return $this->format_plugin_summary_with_link($plugin,
1245                                                                   $submission,
1246                                                                   'grading',
1247                                                                   array());
1248                 }
1249             } else {
1250                 $grade = null;
1251                 if (isset($field)) {
1252                     return $plugin->get_editor_text($field, $row->gradeid);
1253                 }
1255                 if ($row->gradeid) {
1256                     $grade = new stdClass();
1257                     $grade->id = $row->gradeid;
1258                     $grade->timecreated = $row->firstmarked;
1259                     $grade->timemodified = $row->timemarked;
1260                     $grade->assignment = $this->assignment->get_instance()->id;
1261                     $grade->userid = $row->userid;
1262                     $grade->grade = $row->grade;
1263                     $grade->mailed = $row->mailed;
1264                     $grade->attemptnumber = $row->attemptnumber;
1265                 }
1266                 if ($this->quickgrading && $plugin->supports_quickgrading()) {
1267                     return $plugin->get_quickgrading_html($row->userid, $grade);
1268                 } else if ($grade) {
1269                     return $this->format_plugin_summary_with_link($plugin,
1270                                                                   $grade,
1271                                                                   'grading',
1272                                                                   array());
1273                 }
1274             }
1275         }
1276         return '';
1277     }
1279     /**
1280      * Using the current filtering and sorting - load all rows and return a single column from them.
1281      *
1282      * @param string $columnname The name of the raw column data
1283      * @return array of data
1284      */
1285     public function get_column_data($columnname) {
1286         $this->setup();
1287         $this->currpage = 0;
1288         $this->query_db($this->tablemaxrows);
1289         $result = array();
1290         foreach ($this->rawdata as $row) {
1291             $result[] = $row->$columnname;
1292         }
1293         return $result;
1294     }
1296     /**
1297      * Return things to the renderer.
1298      *
1299      * @return string the assignment name
1300      */
1301     public function get_assignment_name() {
1302         return $this->assignment->get_instance()->name;
1303     }
1305     /**
1306      * Return things to the renderer.
1307      *
1308      * @return int the course module id
1309      */
1310     public function get_course_module_id() {
1311         return $this->assignment->get_course_module()->id;
1312     }
1314     /**
1315      * Return things to the renderer.
1316      *
1317      * @return int the course id
1318      */
1319     public function get_course_id() {
1320         return $this->assignment->get_course()->id;
1321     }
1323     /**
1324      * Return things to the renderer.
1325      *
1326      * @return stdClass The course context
1327      */
1328     public function get_course_context() {
1329         return $this->assignment->get_course_context();
1330     }
1332     /**
1333      * Return things to the renderer.
1334      *
1335      * @return bool Does this assignment accept submissions
1336      */
1337     public function submissions_enabled() {
1338         return $this->assignment->is_any_submission_plugin_enabled();
1339     }
1341     /**
1342      * Return things to the renderer.
1343      *
1344      * @return bool Can this user view all grades (the gradebook)
1345      */
1346     public function can_view_all_grades() {
1347         $context = $this->assignment->get_course_context();
1348         return has_capability('gradereport/grader:view', $context) &&
1349                has_capability('moodle/grade:viewall', $context);
1350     }
1352     /**
1353      * Override the table show_hide_link to not show for select column.
1354      *
1355      * @param string $column the column name, index into various names.
1356      * @param int $index numerical index of the column.
1357      * @return string HTML fragment.
1358      */
1359     protected function show_hide_link($column, $index) {
1360         if ($index > 0 || !$this->hasgrade) {
1361             return parent::show_hide_link($column, $index);
1362         }
1363         return '';
1364     }