/**
  * Utility method to get the grade for a user.
  * @param $user
  * @param $assign
  * @param $course
  * @return testable_assign
  */
 private function get_user_assign_grade($user, $assign, $course)
 {
     $gradebookgrades = \grade_get_grades($course->id, 'mod', 'assign', $assign->get_instance()->id, $user->id);
     $gradebookitem = array_shift($gradebookgrades->items);
     $grade = $gradebookitem->grades[$user->id];
     return $grade->str_grade;
 }

 /** add info about this users attaches to the postsdata object
  * 
  * @global object $DB
  * @global record $USER
  * @param record $postsdata
  * @return boolean, true if succeded
  */
 public static function add_attaches_to_posts($courseid, &$postsdata)
 {
     global $DB, $USER;
     if (empty($postsdata->posts)) {
         return false;
     }
     $posts = $postsdata->posts;
     $params = array($USER->id);
     list($inpoststr, $inparams) = $DB->get_in_or_equal(array_keys($posts));
     $params = array_merge($params, $inparams);
     $params[] = $courseid;
     // ... fetch attaches an grade_items.
     $sql = "SELECT at.id as atid, at.postid, at.coursemoduleid, gi.*\n                FROM {format_socialwall_attaches} at\n                JOIN {course_modules} cm ON cm.id = at.coursemoduleid\n                JOIN {modules} m ON m.id = cm.module\n                LEFT JOIN\n                    (SELECT gg.id, gri.iteminstance, gri.itemmodule, gri.itemtype\n                     FROM {grade_items} gri\n                     JOIN {grade_grades} gg ON (gg.itemid = gri.id AND userid = ?)) as\n                     gi ON (gi.itemmodule = m.name AND gi.iteminstance = cm.instance)\n                WHERE postid {$inpoststr} AND cm.course = ?";
     if (!($attaches = $DB->get_records_sql($sql, $params))) {
         return false;
     }
     foreach ($attaches as $attachment) {
         if (!isset($postsdata->posts[$attachment->postid]->attaches)) {
             $postsdata->posts[$attachment->postid]->attaches = array();
             $postsdata->posts[$attachment->postid]->grades = array();
         }
         $postsdata->posts[$attachment->postid]->attaches[$attachment->atid] = $attachment;
         if (!empty($attachment->iteminstance)) {
             $gradedata = grade_get_grades($courseid, $attachment->itemtype, $attachment->itemmodule, $attachment->iteminstance, $USER->id);
             // Add author of grades, to retrieve complete user record later.
             if (!empty($gradedata->outcomes[0]->grades[$USER->id])) {
                 $usermodified = $gradedata->outcomes[0]->grades[$USER->id]->usermodified;
                 $postsdata->authors[$usermodified] = $usermodified;
                 $postsdata->posts[$attachment->postid]->grades[$attachment->coursemoduleid] = $gradedata->outcomes[0];
             }
             if (!empty($gradedata->items[0]->grades[$USER->id])) {
                 $usermodified = $gradedata->items[0]->grades[$USER->id]->usermodified;
                 $postsdata->authors[$usermodified] = $usermodified;
                 $postsdata->posts[$attachment->postid]->grades[$attachment->coursemoduleid] = $gradedata->items[0];
             }
         }
     }
     return true;
 }

//.........这里部分代码省略.........
         // Add a column for the list of valid marking workflow states.
         $columns[] = 'gradecanbechanged';
         $headers[] = get_string('gradecanbechanged', 'assign');
     }
     if (!$this->is_downloading() && $this->hasgrade) {
         // We have to call this column userid so we can use userid as a default sortable column.
         $columns[] = 'userid';
         $headers[] = get_string('edit');
     }
     // Submission plugins.
     if ($assignment->is_any_submission_plugin_enabled()) {
         $columns[] = 'timesubmitted';
         $headers[] = get_string('lastmodifiedsubmission', 'assign');
         foreach ($this->assignment->get_submission_plugins() as $plugin) {
             if ($this->is_downloading()) {
                 if ($plugin->is_visible() && $plugin->is_enabled()) {
                     foreach ($plugin->get_editor_fields() as $field => $description) {
                         $index = 'plugin' . count($this->plugincache);
                         $this->plugincache[$index] = array($plugin, $field);
                         $columns[] = $index;
                         $headers[] = $plugin->get_name();
                     }
                 }
             } else {
                 if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
                     $index = 'plugin' . count($this->plugincache);
                     $this->plugincache[$index] = array($plugin);
                     $columns[] = $index;
                     $headers[] = $plugin->get_name();
                 }
             }
         }
     }
     // Time marked.
     $columns[] = 'timemarked';
     $headers[] = get_string('lastmodifiedgrade', 'assign');
     // Feedback plugins.
     foreach ($this->assignment->get_feedback_plugins() as $plugin) {
         if ($this->is_downloading()) {
             if ($plugin->is_visible() && $plugin->is_enabled()) {
                 foreach ($plugin->get_editor_fields() as $field => $description) {
                     $index = 'plugin' . count($this->plugincache);
                     $this->plugincache[$index] = array($plugin, $field);
                     $columns[] = $index;
                     $headers[] = $description;
                 }
             }
         } else {
             if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
                 $index = 'plugin' . count($this->plugincache);
                 $this->plugincache[$index] = array($plugin);
                 $columns[] = $index;
                 $headers[] = $plugin->get_name();
             }
         }
     }
     // Exclude 'Final grade' column in downloaded grading worksheets.
     if (!$this->is_downloading()) {
         // Final grade.
         $columns[] = 'finalgrade';
         $headers[] = get_string('finalgrade', 'grades');
     }
     // Load the grading info for all users.
     $this->gradinginfo = grade_get_grades($this->assignment->get_course()->id, 'mod', 'assign', $this->assignment->get_instance()->id, $users);
     if (!empty($CFG->enableoutcomes) && !empty($this->gradinginfo->outcomes)) {
         $columns[] = 'outcomes';
         $headers[] = get_string('outcomes', 'grades');
     }
     // Set the columns.
     $this->define_columns($columns);
     $this->define_headers($headers);
     foreach ($extrauserfields as $extrafield) {
         $this->column_class($extrafield, $extrafield);
     }
     $this->no_sorting('recordid');
     $this->no_sorting('finalgrade');
     $this->no_sorting('userid');
     $this->no_sorting('select');
     $this->no_sorting('outcomes');
     if ($assignment->get_instance()->teamsubmission) {
         $this->no_sorting('team');
     }
     $plugincolumnindex = 0;
     foreach ($this->assignment->get_submission_plugins() as $plugin) {
         if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
             $submissionpluginindex = 'plugin' . $plugincolumnindex++;
             $this->no_sorting($submissionpluginindex);
         }
     }
     foreach ($this->assignment->get_feedback_plugins() as $plugin) {
         if ($plugin->is_visible() && $plugin->is_enabled() && $plugin->has_user_summary()) {
             $feedbackpluginindex = 'plugin' . $plugincolumnindex++;
             $this->no_sorting($feedbackpluginindex);
         }
     }
     // When there is no data we still want the column headers printed in the csv file.
     if ($this->is_downloading()) {
         $this->start_output();
     }
 }

 /**
  * Save grade update.
  *
  * @param int $userid
  * @param  stdClass $data
  * @return bool - was the grade saved
  */
 public function save_grade($userid, $data)
 {
     // Need grade permission.
     require_capability('mod/assign:grade', $this->context);
     $instance = $this->get_instance();
     $submission = null;
     if ($instance->teamsubmission) {
         $submission = $this->get_group_submission($userid, 0, false, $data->attemptnumber);
     } else {
         $submission = $this->get_user_submission($userid, false, $data->attemptnumber);
     }
     if ($instance->teamsubmission && $data->applytoall) {
         $groupid = 0;
         if ($this->get_submission_group($userid)) {
             $group = $this->get_submission_group($userid);
             if ($group) {
                 $groupid = $group->id;
             }
         }
         $members = $this->get_submission_group_members($groupid, true);
         foreach ($members as $member) {
             // User may exist in multple groups (which should put them in the default group).
             $this->apply_grade_to_user($data, $member->id, $data->attemptnumber);
             $this->process_outcomes($member->id, $data);
         }
     } else {
         $this->apply_grade_to_user($data, $userid, $data->attemptnumber);
         $this->process_outcomes($userid, $data);
     }
     $maxattemptsreached = !empty($submission) && $submission->attemptnumber >= $instance->maxattempts - 1 && $instance->maxattempts != ASSIGN_UNLIMITED_ATTEMPTS;
     $shouldreopen = false;
     if ($instance->attemptreopenmethod == ASSIGN_ATTEMPT_REOPEN_METHOD_UNTILPASS) {
         // Check the gradetopass from the gradebook.
         $gradinginfo = grade_get_grades($this->get_course()->id, 'mod', 'assign', $instance->id, $userid);
         // What do we do if the grade has not been added to the gradebook (e.g. blind marking)?
         $gradingitem = null;
         $gradebookgrade = null;
         if (isset($gradinginfo->items[0])) {
             $gradingitem = $gradinginfo->items[0];
             $gradebookgrade = $gradingitem->grades[$userid];
         }
         if ($gradebookgrade) {
             // TODO: This code should call grade_grade->is_passed().
             $shouldreopen = true;
             if (is_null($gradebookgrade->grade)) {
                 $shouldreopen = false;
             }
             if (empty($gradingitem->gradepass) || $gradingitem->gradepass == $gradingitem->grademin) {
                 $shouldreopen = false;
             }
             if ($gradebookgrade->grade >= $gradingitem->gradepass) {
                 $shouldreopen = false;
             }
         }
     }
     if ($instance->attemptreopenmethod == ASSIGN_ATTEMPT_REOPEN_METHOD_MANUAL && !empty($data->addattempt)) {
         $shouldreopen = true;
     }
     // Never reopen if we are editing a previous attempt.
     if ($data->attemptnumber != -1) {
         $shouldreopen = false;
     }
     if ($shouldreopen && !$maxattemptsreached) {
         $this->add_attempt($userid);
     }
     return true;
 }

/**
 * Print the grade information for the assignment for this user
 *
 * @param stdClass $course
 * @param stdClass $user
 * @param stdClass $coursemodule
 * @param stdClass $assignment
 */
function assign_user_outline($course, $user, $coursemodule, $assignment)
{
    global $CFG;
    require_once $CFG->libdir . '/gradelib.php';
    require_once $CFG->dirroot . '/grade/grading/lib.php';
    $gradinginfo = grade_get_grades($course->id, 'mod', 'assign', $assignment->id, $user->id);
    $gradingitem = $gradinginfo->items[0];
    $gradebookgrade = $gradingitem->grades[$user->id];
    if (!$gradebookgrade) {
        return null;
    }
    $result = new stdClass();
    $result->info = get_string('outlinegrade', 'assign', $gradebookgrade->grade);
    $result->time = $gradebookgrade->dategraded;
    return $result;
}

/**
 * Get a grade for the given user from the gradebook.
 *
 * @param integer $userid        ID of the user
 * @param integer $courseid      ID of the course
 * @param integer $facetofaceid  ID of the Face-to-face activity
 *
 * @returns object String grade and the time that it was graded
 */
function facetoface_get_grade($userid, $courseid, $facetofaceid) {

    $ret = new stdClass();
    $ret->grade = 0;
    $ret->dategraded = 0;

    $grading_info = grade_get_grades($courseid, 'mod', 'facetoface', $facetofaceid, $userid);
    if (!empty($grading_info->items)) {
        $ret->grade = $grading_info->items[0]->grades[$userid]->str_grade;
        $ret->dategraded = $grading_info->items[0]->grades[$userid]->dategraded;
    }

    return $ret;
}

 /**
  * Save outcomes submitted from grading form.
  *
  * @param int $userid
  * @param stdClass $formdata
  * @param int $sourceuserid The user ID under which the outcome data is accessible. This is relevant
  *                          for an outcome set to a user but applied to an entire group.
  */
 protected function process_outcomes($userid, $formdata, $sourceuserid = null)
 {
     global $CFG, $USER;
     if (empty($CFG->enableoutcomes)) {
         return;
     }
     if ($this->grading_disabled($userid)) {
         return;
     }
     require_once $CFG->libdir . '/gradelib.php';
     $data = array();
     $gradinginfo = grade_get_grades($this->get_course()->id, 'mod', 'assign', $this->get_instance()->id, $userid);
     if (!empty($gradinginfo->outcomes)) {
         foreach ($gradinginfo->outcomes as $index => $oldoutcome) {
             $name = 'outcome_' . $index;
             $sourceuserid = $sourceuserid !== null ? $sourceuserid : $userid;
             if (isset($formdata->{$name}[$sourceuserid]) && $oldoutcome->grades[$userid]->grade != $formdata->{$name}[$sourceuserid]) {
                 $data[$index] = $formdata->{$name}[$sourceuserid];
             }
         }
     }
     if (count($data) > 0) {
         grade_update_outcomes('mod/assign', $this->course->id, 'mod', 'assign', $this->get_instance()->id, $userid, $data);
     }
 }

 /**
  *  Display all the submissions ready for grading
  */
 function display_submissions($message = '')
 {
     global $CFG, $db, $USER;
     require_once $CFG->libdir . '/gradelib.php';
     /* first we check to see if the form has just been submitted
      * to request user_preference updates
      */
     /*if (isset($_POST['updatepref'])){
           $perpage = optional_param('perpage', 10, PARAM_INT);
           $perpage = ($perpage <= 0) ? 10 : $perpage ;
           set_user_preference('problemstatement_perpage', $perpage);
           set_user_preference('problemstatement_quickgrade', optional_param('quickgrade', 0, PARAM_BOOL));
       }*/
     /* next we get perpage and quickgrade (allow quick grade) params
      * from database
      */
     $perpage = get_user_preferences('problemstatement_perpage', 10);
     $quickgrade = get_user_preferences('problemstatement_quickgrade', 0);
     $grading_info = grade_get_grades($this->course->id, 'mod', 'problemstatement', $this->problemstatement->id);
     if (!empty($CFG->enableoutcomes) and !empty($grading_info->outcomes)) {
         $uses_outcomes = true;
     } else {
         $uses_outcomes = false;
     }
     $page = optional_param('page', 0, PARAM_INT);
     $strsaveallfeedback = get_string('saveallfeedback', 'problemstatement');
     /// Some shortcuts to make the code read better
     $course = $this->course;
     $problemstatement = $this->problemstatement;
     $cm = $this->cm;
     $tabindex = 1;
     //tabindex for quick grading tabbing; Not working for dropdowns yet
     add_to_log($course->id, 'problemstatement', 'view submission', 'submissions.php?id=' . $this->problemstatement->id, $this->problemstatement->id, $this->cm->id);
     $navigation = build_navigation($this->strsubmissions, $this->cm);
     print_header_simple(format_string($this->problemstatement->name, true), "", $navigation, '', '', true, update_module_button($cm->id, $course->id, $this->strproblemstatement), navmenu($course, $cm));
     $course_context = get_context_instance(CONTEXT_COURSE, $course->id);
     if (has_capability('gradereport/grader:view', $course_context) && has_capability('moodle/grade:viewall', $course_context)) {
         echo '<div class="allcoursegrades"><a href="' . $CFG->wwwroot . '/grade/report/grader/index.php?id=' . $course->id . '">' . get_string('seeallcoursegrades', 'grades') . '</a></div>';
     }
     if (!empty($message)) {
         echo $message;
         // display messages here if any
     }
     $context = get_context_instance(CONTEXT_MODULE, $cm->id);
     /// Check to see if groups are being used in this problemstatement
     /// find out current groups mode
     $groupmode = groups_get_activity_groupmode($cm);
     $currentgroup = groups_get_activity_group($cm, true);
     groups_print_activity_menu($cm, 'submissions.php?id=' . $this->cm->id);
     /// Get all ppl that are allowed to submit problemstatements
     if ($users = get_users_by_capability($context, 'mod/problemstatement:submit', 'u.id', '', '', '', $currentgroup, '', false)) {
         $users = array_keys($users);
     }
     // if groupmembersonly used, remove users who are not in any group
     if ($users and !empty($CFG->enablegroupings) and $cm->groupmembersonly) {
         if ($groupingusers = groups_get_grouping_members($cm->groupingid, 'u.id', 'u.id')) {
             $users = array_intersect($users, array_keys($groupingusers));
         }
     }
     $tablecolumns = array('picture', 'fullname', 'grade', 'submissioncomment', 'timemodified', 'timemarked', 'status', 'finalgrade');
     if ($uses_outcomes) {
         $tablecolumns[] = 'outcome';
         // no sorting based on outcomes column
     }
     $tableheaders = array('', get_string('fullname'), get_string('grade'), get_string('comment', 'problemstatement'), get_string('lastmodified') . ' (' . $course->student . ')', get_string('lastmodified') . ' (' . $course->teacher . ')', get_string('status'), get_string('finalgrade', 'grades'));
     if ($uses_outcomes) {
         $tableheaders[] = get_string('outcome', 'grades');
     }
     require_once $CFG->libdir . '/tablelib.php';
     $table = new flexible_table('mod-problemstatement-submissions');
     $table->define_columns($tablecolumns);
     $table->define_headers($tableheaders);
     $table->define_baseurl($CFG->wwwroot . '/mod/problemstatement/submissions.php?id=' . $this->cm->id . '&amp;currentgroup=' . $currentgroup);
     $table->sortable(true, 'lastname');
     //sorted by lastname by default
     $table->collapsible(true);
     $table->initialbars(true);
     $table->column_suppress('picture');
     $table->column_suppress('fullname');
     $table->column_class('picture', 'picture');
     $table->column_class('fullname', 'fullname');
     $table->column_class('grade', 'grade');
     $table->column_class('submissioncomment', 'comment');
     $table->column_class('timemodified', 'timemodified');
     $table->column_class('timemarked', 'timemarked');
     $table->column_class('status', 'status');
     $table->column_class('finalgrade', 'finalgrade');
     if ($uses_outcomes) {
         $table->column_class('outcome', 'outcome');
     }
     $table->set_attribute('cellspacing', '0');
     $table->set_attribute('id', 'attempts');
     $table->set_attribute('class', 'submissions');
     $table->set_attribute('width', '100%');
     //$table->set_attribute('align', 'center');
     $table->no_sorting('finalgrade');
     $table->no_sorting('outcome');
//.........这里部分代码省略.........

 /**
  * Performs the synchronisation of grades.
  *
  * @return bool|void
  */
 public function execute()
 {
     global $DB, $CFG;
     require_once $CFG->dirroot . '/enrol/lti/ims-blti/OAuth.php';
     require_once $CFG->dirroot . '/enrol/lti/ims-blti/OAuthBody.php';
     require_once $CFG->dirroot . '/lib/completionlib.php';
     require_once $CFG->libdir . '/gradelib.php';
     require_once $CFG->dirroot . '/grade/querylib.php';
     // Check if the authentication plugin is disabled.
     if (!is_enabled_auth('lti')) {
         mtrace('Skipping task - ' . get_string('pluginnotenabled', 'auth', get_string('pluginname', 'auth_lti')));
         return true;
     }
     // Check if the enrolment plugin is disabled - isn't really necessary as the task should not run if
     // the plugin is disabled, but there is no harm in making sure core hasn't done something wrong.
     if (!enrol_is_enabled('lti')) {
         mtrace('Skipping task - ' . get_string('enrolisdisabled', 'enrol_lti'));
         return true;
     }
     // Get all the enabled tools.
     if ($tools = \enrol_lti\helper::get_lti_tools(array('status' => ENROL_INSTANCE_ENABLED, 'gradesync' => 1))) {
         foreach ($tools as $tool) {
             mtrace("Starting - Grade sync for shared tool '{$tool->id}' for the course '{$tool->courseid}'.");
             // Variables to keep track of information to display later.
             $usercount = 0;
             $sendcount = 0;
             // We check for all the users - users can access the same tool from different consumers.
             if ($ltiusers = $DB->get_records('enrol_lti_users', array('toolid' => $tool->id), 'lastaccess DESC')) {
                 $completion = new \completion_info(get_course($tool->courseid));
                 foreach ($ltiusers as $ltiuser) {
                     $mtracecontent = "for the user '{$ltiuser->userid}' in the tool '{$tool->id}' for the course " . "'{$tool->courseid}'";
                     $usercount = $usercount + 1;
                     // Check if we do not have a serviceurl - this can happen if the sync process has an unexpected error.
                     if (empty($ltiuser->serviceurl)) {
                         mtrace("Skipping - Empty serviceurl {$mtracecontent}.");
                         continue;
                     }
                     // Check if we do not have a sourceid - this can happen if the sync process has an unexpected error.
                     if (empty($ltiuser->sourceid)) {
                         mtrace("Skipping - Empty sourceid {$mtracecontent}.");
                         continue;
                     }
                     // Need a valid context to continue.
                     if (!($context = \context::instance_by_id($tool->contextid))) {
                         mtrace("Failed - Invalid contextid '{$tool->contextid}' for the tool '{$tool->id}'.");
                         continue;
                     }
                     // Ok, let's get the grade.
                     $grade = false;
                     if ($context->contextlevel == CONTEXT_COURSE) {
                         // Check if the user did not completed the course when it was required.
                         if ($tool->gradesynccompletion && !$completion->is_course_complete($ltiuser->userid)) {
                             mtrace("Skipping - Course not completed {$mtracecontent}.");
                             continue;
                         }
                         // Get the grade.
                         if ($grade = grade_get_course_grade($ltiuser->userid, $tool->courseid)) {
                             $grademax = floatval($grade->item->grademax);
                             $grade = $grade->grade;
                         }
                     } else {
                         if ($context->contextlevel == CONTEXT_MODULE) {
                             $cm = get_coursemodule_from_id(false, $context->instanceid, 0, false, MUST_EXIST);
                             if ($tool->gradesynccompletion) {
                                 $data = $completion->get_data($cm, false, $ltiuser->userid);
                                 if ($data->completionstate != COMPLETION_COMPLETE_PASS && $data->completionstate != COMPLETION_COMPLETE) {
                                     mtrace("Skipping - Activity not completed {$mtracecontent}.");
                                     continue;
                                 }
                             }
                             $grades = grade_get_grades($cm->course, 'mod', $cm->modname, $cm->instance, $ltiuser->userid);
                             if (!empty($grades->items[0]->grades)) {
                                 $grade = reset($grades->items[0]->grades);
                                 if (!empty($grade->item)) {
                                     $grademax = floatval($grade->item->grademax);
                                 } else {
                                     $grademax = floatval($grades->items[0]->grademax);
                                 }
                                 $grade = $grade->grade;
                             }
                         }
                     }
                     if ($grade === false || $grade === null || strlen($grade) < 1) {
                         mtrace("Skipping - Invalid grade {$mtracecontent}.");
                         continue;
                     }
                     // No need to be dividing by zero.
                     if (empty($grademax)) {
                         mtrace("Skipping - Invalid grade {$mtracecontent}.");
                         continue;
                     }
                     // This can happen if the sync process has an unexpected error.
                     if ($grade == $ltiuser->lastgrade) {
                         mtrace("Not sent - The grade {$mtracecontent} was not sent as the grades are the same.");
                         continue;
//.........这里部分代码省略.........

 function view_feedback($submission = NULL)
 {
     global $USER, $CFG;
     require_once $CFG->libdir . '/gradelib.php';
     if (!$submission) {
         /// Get submission for this assignment
         $submission = $this->get_submission($USER->id);
     }
     if (empty($submission->timemarked)) {
         /// Nothing to show, so print nothing
         if ($this->count_responsefiles($USER->id)) {
             print_heading(get_string('responsefiles', 'assignment', $this->course->teacher), '', 3);
             $responsefiles = $this->print_responsefiles($USER->id, true);
             print_simple_box($responsefiles, 'center');
         }
         return;
     }
     $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id, $USER->id);
     $item = $grading_info->items[0];
     $grade = $item->grades[$USER->id];
     if ($grade->hidden or $grade->grade === false) {
         // hidden or error
         return;
     }
     if ($grade->grade === null and empty($grade->str_feedback)) {
         /// Nothing to show yet
         return;
     }
     $graded_date = $grade->dategraded;
     $graded_by = $grade->usermodified;
     /// We need the teacher info
     if (!($teacher = get_record('user', 'id', $graded_by))) {
         error('Could not find the teacher');
     }
     /// Print the feedback
     print_heading(get_string('submissionfeedback', 'assignment'), '', 3);
     echo '<table cellspacing="0" class="feedback">';
     echo '<tr>';
     echo '<td class="left picture">';
     print_user_picture($teacher, $this->course->id, $teacher->picture);
     echo '</td>';
     echo '<td class="topic">';
     echo '<div class="from">';
     echo '<div class="fullname">' . fullname($teacher) . '</div>';
     echo '<div class="time">' . userdate($graded_date) . '</div>';
     echo '</div>';
     echo '</td>';
     echo '</tr>';
     echo '<tr>';
     echo '<td class="left side">&nbsp;</td>';
     echo '<td class="content">';
     if ($this->assignment->grade) {
         echo '<div class="grade">';
         echo get_string("grade") . ': ' . $grade->str_long_grade;
         echo '</div>';
         echo '<div class="clearer"></div>';
     }
     echo '<div class="comment">';
     echo $grade->str_feedback;
     echo '</div>';
     echo '</tr>';
     echo '<tr>';
     echo '<td class="left side">&nbsp;</td>';
     echo '<td class="content">';
     echo $this->print_responsefiles($USER->id, true);
     echo '</tr>';
     echo '</table>';
 }

/**
 * Create grade item for given quiz
 *
 * @param object $quiz object with extra cmidnumber
 * @param mixed optional array/object of grade(s); 'reset' means reset grades in gradebook
 * @return int 0 if ok, error code otherwise
 */
function quiz_grade_item_update($quiz, $grades = NULL)
{
    global $CFG;
    if (!function_exists('grade_update')) {
        //workaround for buggy PHP versions
        require_once $CFG->libdir . '/gradelib.php';
    }
    if (array_key_exists('cmidnumber', $quiz)) {
        //it may not be always present
        $params = array('itemname' => $quiz->name, 'idnumber' => $quiz->cmidnumber);
    } else {
        $params = array('itemname' => $quiz->name);
    }
    if ($quiz->grade > 0) {
        $params['gradetype'] = GRADE_TYPE_VALUE;
        $params['grademax'] = $quiz->grade;
        $params['grademin'] = 0;
    } else {
        $params['gradetype'] = GRADE_TYPE_NONE;
    }
    /* description by TJ:
    1/ If the quiz is set to not show scores while the quiz is still open, and is set to show scores after
       the quiz is closed, then create the grade_item with a show-after date that is the quiz close date.
    2/ If the quiz is set to not show scores at either of those times, create the grade_item as hidden.
    3/ If the quiz is set to show scores, create the grade_item visible.
    */
    if (!($quiz->review & QUIZ_REVIEW_SCORES & QUIZ_REVIEW_CLOSED) and !($quiz->review & QUIZ_REVIEW_SCORES & QUIZ_REVIEW_OPEN)) {
        $params['hidden'] = 1;
    } else {
        if ($quiz->review & QUIZ_REVIEW_SCORES & QUIZ_REVIEW_CLOSED and !($quiz->review & QUIZ_REVIEW_SCORES & QUIZ_REVIEW_OPEN)) {
            if ($quiz->timeclose) {
                $params['hidden'] = $quiz->timeclose;
            } else {
                $params['hidden'] = 1;
            }
        } else {
            // a) both open and closed enabled
            // b) open enabled, closed disabled - we can not "hide after", grades are kept visible even after closing
            $params['hidden'] = 0;
        }
    }
    if ($grades === 'reset') {
        $params['reset'] = true;
        $grades = NULL;
    }
    $gradebook_grades = grade_get_grades($quiz->course, 'mod', 'quiz', $quiz->id);
    if (!empty($gradebook_grades->items)) {
        $grade_item = $gradebook_grades->items[0];
        if ($grade_item->locked) {
            $confirm_regrade = optional_param('confirm_regrade', 0, PARAM_INT);
            if (!$confirm_regrade) {
                $message = get_string('gradeitemislocked', 'grades');
                $back_link = $CFG->wwwroot . '/mod/quiz/report.php?q=' . $quiz->id . '&mode=overview';
                $regrade_link = qualified_me() . '&confirm_regrade=1';
                print_box_start('generalbox', 'notice');
                echo '<p>' . $message . '</p>';
                echo '<div class="buttons">';
                print_single_button($regrade_link, null, get_string('regradeanyway', 'grades'), 'post', $CFG->framename);
                print_single_button($back_link, null, get_string('cancel'), 'post', $CFG->framename);
                echo '</div>';
                print_box_end();
                return GRADE_UPDATE_ITEM_LOCKED;
            }
        }
    }
    return grade_update('mod/quiz', $quiz->course, 'mod', 'quiz', $quiz->id, 0, $grades, $params);
}

/**
 * Write in the worksheet the given facetoface attendance information
 * filtered by location.
 *
 * This function includes lots of custom SQL because it's otherwise
 * way too slow.
 *
 * @param object  $worksheet    Currently open worksheet
 * @param integer $startingrow  Index of the starting row (usually 1)
 * @param integer $facetofaceid ID of the facetoface activity
 * @param string  $location     Location to filter by
 * @param string  $coursename   Name of the course (optional)
 * @param string  $activityname Name of the facetoface activity (optional)
 * @param object  $dateformat   Use to write out dates in the spreadsheet
 * @returns integer Index of the last row written
 */
function facetoface_write_activity_attendance(&$worksheet, $startingrow, $facetofaceid, $location, $coursename, $activityname, $dateformat)
{
    global $CFG, $DB;
    $trainerroles = facetoface_get_trainer_roles();
    $userfields = facetoface_get_userfields();
    $customsessionfields = facetoface_get_session_customfields();
    $timenow = time();
    $i = $startingrow;
    $locationcondition = '';
    $locationparam = array();
    if (!empty($location)) {
        $locationcondition = "AND s.location = ?";
        $locationparam = array($location);
    }
    // Fast version of "facetoface_get_attendees()" for all sessions.
    $sessionsignups = array();
    $signups = $DB->get_records_sql("\n        SELECT\n            su.id AS submissionid,\n            s.id AS sessionid,\n            u.*,\n            f.course AS courseid,\n            ss.grade,\n            sign.timecreated\n        FROM\n            {facetoface} f\n        JOIN\n            {facetoface_sessions} s\n         ON s.facetoface = f.id\n        JOIN\n            {facetoface_signups} su\n         ON s.id = su.sessionid\n        JOIN\n            {facetoface_signups_status} ss\n         ON su.id = ss.signupid\n        LEFT JOIN\n            (\n            SELECT\n                ss.signupid,\n                MAX(ss.timecreated) AS timecreated\n            FROM\n                {facetoface_signups_status} ss\n            INNER JOIN\n                {facetoface_signups} s\n             ON s.id = ss.signupid\n            INNER JOIN\n                {facetoface_sessions} se\n             ON s.sessionid = se.id\n            AND se.facetoface = {$facetofaceid}\n            WHERE\n                ss.statuscode IN (?,?)\n            GROUP BY\n                ss.signupid\n            ) sign\n         ON su.id = sign.signupid\n        JOIN\n            {user} u\n         ON u.id = su.userid\n        WHERE\n            f.id = ?\n        AND ss.superceded != 1\n        AND ss.statuscode >= ?\n        ORDER BY\n            s.id, u.firstname, u.lastname\n    ", array(MDL_F2F_STATUS_BOOKED, MDL_F2F_STATUS_WAITLISTED, $facetofaceid, MDL_F2F_STATUS_APPROVED));
    if ($signups) {
        // Get all grades at once.
        $userids = array();
        foreach ($signups as $signup) {
            if ($signup->id > 0) {
                $userids[] = $signup->id;
            }
        }
        $gradinginfo = grade_get_grades(reset($signups)->courseid, 'mod', 'facetoface', $facetofaceid, $userids);
        foreach ($signups as $signup) {
            $userid = $signup->id;
            if ($customuserfields = facetoface_get_user_customfields($userid, $userfields)) {
                foreach ($customuserfields as $fieldname => $value) {
                    if (!isset($signup->{$fieldname})) {
                        $signup->{$fieldname} = $value;
                    }
                }
            }
            // Set grade.
            if (!empty($gradinginfo->items) and !empty($gradinginfo->items[0]->grades[$userid])) {
                $signup->grade = $gradinginfo->items[0]->grades[$userid]->str_grade;
            }
            $sessionsignups[$signup->sessionid][$signup->id] = $signup;
        }
    }
    // Fast version of "facetoface_get_sessions($facetofaceid, $location)".
    $sql = "SELECT d.id as dateid, s.id, s.datetimeknown, s.capacity,\n                   s.duration, d.timestart, d.timefinish\n              FROM {facetoface_sessions} s\n              JOIN {facetoface_sessions_dates} d ON s.id = d.sessionid\n              WHERE\n                s.facetoface = ?\n              AND d.sessionid = s.id\n                   {$locationcondition}\n                   ORDER BY s.datetimeknown, d.timestart";
    $sessions = $DB->get_records_sql($sql, array_merge(array($facetofaceid), $locationparam));
    $i = $i - 1;
    // Will be incremented BEFORE each row is written.
    foreach ($sessions as $session) {
        $customdata = $DB->get_records('facetoface_session_data', array('sessionid' => $session->id), '', 'fieldid, data');
        $sessiondate = false;
        $starttime = get_string('wait-listed', 'facetoface');
        $finishtime = get_string('wait-listed', 'facetoface');
        $status = get_string('wait-listed', 'facetoface');
        $sessiontrainers = facetoface_get_trainers($session->id);
        if ($session->datetimeknown) {
            // Display only the first date.
            if (method_exists($worksheet, 'write_date')) {
                // Needs the patch in MDL-20781.
                $sessiondate = (int) $session->timestart;
            } else {
                $sessiondate = userdate($session->timestart, get_string('strftimedate', 'langconfig'));
            }
            $starttime = userdate($session->timestart, get_string('strftimetime', 'langconfig'));
            $finishtime = userdate($session->timefinish, get_string('strftimetime', 'langconfig'));
            if ($session->timestart < $timenow) {
                $status = get_string('sessionover', 'facetoface');
            } else {
                $signupcount = 0;
                if (!empty($sessionsignups[$session->id])) {
                    $signupcount = count($sessionsignups[$session->id]);
                }
                if ($signupcount >= $session->capacity) {
                    $status = get_string('bookingfull', 'facetoface');
                } else {
                    $status = get_string('bookingopen', 'facetoface');
                }
            }
        }
        if (!empty($sessionsignups[$session->id])) {
            foreach ($sessionsignups[$session->id] as $attendee) {
                $i++;
                $j = 0;
                // Custom session fields.
                foreach ($customsessionfields as $field) {
//.........这里部分代码省略.........

 public function test_update_submission()
 {
     $this->create_extra_users();
     $this->setUser($this->editingteachers[0]);
     $assign = $this->create_instance();
     $this->setUser($this->extrastudents[0]);
     $now = time();
     $submission = $assign->get_user_submission($this->extrastudents[0]->id, true);
     $assign->testable_update_submission($submission, $this->extrastudents[0]->id, true, false);
     $this->setUser($this->teachers[0]);
     // Verify the gradebook update.
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrastudents[0]->id);
     $this->assertEquals($this->extrastudents[0]->id, $gradinginfo->items[0]->grades[$this->extrastudents[0]->id]->usermodified);
     // Now verify group assignments.
     $this->setUser($this->editingteachers[0]);
     $assign = $this->create_instance(array('teamsubmission' => 1));
     $this->setUser($this->extrastudents[0]);
     $now = time();
     $submission = $assign->get_group_submission($this->extrastudents[0]->id, 0, true);
     $assign->testable_update_submission($submission, $this->extrastudents[0]->id, true, true);
     // Check that at least 2 active members and 1 suspended member of the submission group had their submission updated.
     $this->setUser($this->editingteachers[0]);
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrastudents[0]->id);
     $this->assertEquals($this->extrastudents[0]->id, $gradinginfo->items[0]->grades[$this->extrastudents[0]->id]->usermodified);
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrastudents[self::GROUP_COUNT]->id);
     $this->assertEquals($this->extrastudents[self::GROUP_COUNT]->id, $gradinginfo->items[0]->grades[$this->extrastudents[self::GROUP_COUNT]->id]->usermodified);
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrasuspendedstudents[0]->id);
     $this->assertEquals($this->extrasuspendedstudents[0]->id, $gradinginfo->items[0]->grades[$this->extrasuspendedstudents[0]->id]->usermodified);
     // Check the same with non-editing teacher and make sure submission is not updated for suspended user.
     $this->setUser($this->editingteachers[0]);
     $assign = $this->create_instance(array('teamsubmission' => 1));
     $this->setUser($this->extrastudents[1]);
     $now = time();
     $submission = $assign->get_group_submission($this->extrastudents[1]->id, 0, true);
     $assign->testable_update_submission($submission, $this->extrastudents[1]->id, true, true);
     $this->setUser($this->teachers[0]);
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrastudents[1]->id);
     $this->assertEquals($this->extrastudents[1]->id, $gradinginfo->items[0]->grades[$this->extrastudents[1]->id]->usermodified);
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrastudents[self::GROUP_COUNT + 1]->id);
     $this->assertEquals($this->extrastudents[self::GROUP_COUNT + 1]->id, $gradinginfo->items[0]->grades[$this->extrastudents[self::GROUP_COUNT + 1]->id]->usermodified);
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrasuspendedstudents[1]->id);
     $this->assertEquals($this->extrasuspendedstudents[1]->id, $gradinginfo->items[0]->grades[$this->extrasuspendedstudents[1]->id]->usermodified);
     // Now verify blind marking.
     $this->setUser($this->editingteachers[0]);
     $assign = $this->create_instance(array('blindmarking' => 1));
     $this->setUser($this->extrastudents[0]);
     $now = time();
     $submission = $assign->get_user_submission($this->extrastudents[0]->id, true);
     $assign->testable_update_submission($submission, $this->extrastudents[0]->id, true, false);
     $this->setUser($this->editingteachers[0]);
     $gradinginfo = grade_get_grades($this->course->id, 'mod', 'assign', $assign->get_instance()->id, $this->extrastudents[0]->id);
     $this->assertEquals(null, $gradinginfo->items[0]->grades[$this->extrastudents[0]->id]->datesubmitted);
 }

 /**
  * Process and save the data from the feedback form. Mostly lifted fro