mod/quiz/override_form.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/>.
  16
  17 /**
  18  * Settings form for overrides in the quiz module.
  19  *
  20  * @package    mod
  21  * @subpackage quiz
  22  * @copyright  2010 Matt Petro
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 require_once($CFG->libdir . '/formslib.php');
  30
  31
  32 /**
  33  * Form for editing settings overrides.
  34  *
  35  * @copyright  2010 Matt Petro
  36  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  37  */
  38 class quiz_override_form extends moodleform {
  39
  40     /** @var object course module object. */
  41     protected $cm;
  42
  43     /** @var object the quiz settings object. */
  44     protected $quiz;
  45
  46     /** @var context the quiz context. */
  47     protected $context;
  48
  49     /** @var bool editing group override (true) or user override (false). */
  50     protected $groupmode;
  51
  52     /** @var int groupid, if provided. */
  53     protected $groupid;
  54
  55     /** @var int userid, if provided. */
  56     protected $userid;
  57
  58     /**
  59      * Constructor.
  60      * @param moodle_url $submiturl the form action URL.
  61      * @param object course module object.
  62      * @param object the quiz settings object.
  63      * @param context the quiz context.
  64      * @param bool editing group override (true) or user override (false).
  65      * @param object $override the override being edited, if it already exists.
  66      */
  67     public function __construct($submiturl, $cm, $quiz, $context, $groupmode, $override) {
  68
  69         $this->cm = $cm;
  70         $this->quiz = $quiz;
  71         $this->context = $context;
  72         $this->groupmode = $groupmode;
  73         $this->groupid = empty($override->groupid) ? 0 : $override->groupid;
  74         $this->userid = empty($override->userid) ? 0 : $override->userid;
  75
  76         parent::__construct($submiturl, null, 'post');
  77
  78     }
  79
  80     protected function definition() {
  81         global $CFG, $DB;
  82
  83         $cm = $this->cm;
  84         $mform = $this->_form;
  85
  86         $mform->addElement('header', 'override', get_string('override', 'quiz'));
  87
  88         if ($this->groupmode) {
  89             // Group override.
  90             if ($this->groupid) {
  91                 // There is already a groupid, so freeze the selector.
  92                 $groupchoices = array();
  93                 $groupchoices[$this->groupid] = groups_get_group_name($this->groupid);
  94                 $mform->addElement('select', 'groupid',
  95                         get_string('overridegroup', 'quiz'), $groupchoices);
  96                 $mform->freeze('groupid');
  97             } else {
  98                 // Prepare the list of groups.
  99                 $groups = groups_get_all_groups($cm->course);
 100                 if (empty($groups)) {
 101                     // Generate an error.
 102                     $link = new moodle_url('/mod/quiz/overrides.php', array('cmid'=>$cm->id));
 103                     print_error('groupsnone', 'quiz', $link);
 104                 }
 105
 106                 $groupchoices = array();
 107                 foreach ($groups as $group) {
 108                     $groupchoices[$group->id] = $group->name;
 109                 }
 110                 unset($groups);
 111
 112                 if (count($groupchoices) == 0) {
 113                     $groupchoices[0] = get_string('none');
 114                 }
 115
 116                 $mform->addElement('select', 'groupid',
 117                         get_string('overridegroup', 'quiz'), $groupchoices);
 118                 $mform->addRule('groupid', get_string('required'), 'required', null, 'client');
 119             }
 120         } else {
 121             // User override.
 122             if ($this->userid) {
 123                 // There is already a userid, so freeze the selector.
 124                 $user = $DB->get_record('user', array('id'=>$this->userid));
 125                 $userchoices = array();
 126                 $userchoices[$this->userid] = fullname($user);
 127                 $mform->addElement('select', 'userid',
 128                         get_string('overrideuser', 'quiz'), $userchoices);
 129                 $mform->freeze('userid');
 130             } else {
 131                 // Prepare the list of users.
 132                 $users = array();
 133                 list($sort, $sortparams) = users_order_by_sql('u');
 134                 if (!empty($sortparams)) {
 135                     throw new coding_exception('users_order_by_sql returned some query parameters. ' .
 136                             'This is unexpected, and a problem because there is no way to pass these ' .
 137                             'parameters to get_users_by_capability. See MDL-34657.');
 138                 }
 139                 if (!empty($CFG->enablegroupmembersonly) && $cm->groupmembersonly) {
 140                     // Only users from the grouping.
 141                     $groups = groups_get_all_groups($cm->course, 0, $cm->groupingid);
 142                     if (!empty($groups)) {
 143                         $users = get_users_by_capability($this->context, 'mod/quiz:attempt',
 144                                 'u.id, u.firstname, u.lastname, u.email',
 145                                 $sort, '', '', array_keys($groups),
 146                                 '', false, true);
 147                     }
 148                 } else {
 149                     $users = get_users_by_capability($this->context, 'mod/quiz:attempt',
 150                             'u.id, u.firstname, u.lastname, u.email' ,
 151                             $sort, '', '', '', '', false, true);
 152                 }
 153                 if (empty($users)) {
 154                     // Generate an error.
 155                     $link = new moodle_url('/mod/quiz/overrides.php', array('cmid'=>$cm->id));
 156                     print_error('usersnone', 'quiz', $link);
 157                 }
 158
 159                 $userchoices = array();
 160                 foreach ($users as $id => $user) {
 161                     if (empty($invalidusers[$id]) || (!empty($override) &&
 162                             $id == $override->userid)) {
 163                         $userchoices[$id] = fullname($user) . ', ' . $user->email;
 164                     }
 165                 }
 166                 unset($users);
 167
 168                 if (count($userchoices) == 0) {
 169                     $userchoices[0] = get_string('none');
 170                 }
 171                 $mform->addElement('searchableselector', 'userid',
 172                         get_string('overrideuser', 'quiz'), $userchoices);
 173                 $mform->addRule('userid', get_string('required'), 'required', null, 'client');
 174             }
 175         }
 176
 177         // Password.
 178         // This field has to be above the date and timelimit fields,
 179         // otherwise browsers will clear it when those fields are changed.
 180         $mform->addElement('passwordunmask', 'password', get_string('requirepassword', 'quiz'));
 181         $mform->setType('password', PARAM_TEXT);
 182         $mform->addHelpButton('password', 'requirepassword', 'quiz');
 183         $mform->setDefault('password', $this->quiz->password);
 184
 185         // Open and close dates.
 186         $mform->addElement('date_time_selector', 'timeopen',
 187                 get_string('quizopen', 'quiz'), array('optional' => true));
 188         $mform->setDefault('timeopen', $this->quiz->timeopen);
 189
 190         $mform->addElement('date_time_selector', 'timeclose',
 191                 get_string('quizclose', 'quiz'), array('optional' => true));
 192         $mform->setDefault('timeclose', $this->quiz->timeclose);
 193
 194         // Time limit.
 195         $mform->addElement('duration', 'timelimit',
 196                 get_string('timelimit', 'quiz'), array('optional' => true));
 197         $mform->addHelpButton('timelimit', 'timelimit', 'quiz');
 198         $mform->setDefault('timelimit', $this->quiz->timelimit);
 199
 200         // Number of attempts.
 201         $attemptoptions = array('0' => get_string('unlimited'));
 202         for ($i = 1; $i <= QUIZ_MAX_ATTEMPT_OPTION; $i++) {
 203             $attemptoptions[$i] = $i;
 204         }
 205         $mform->addElement('select', 'attempts',
 206                 get_string('attemptsallowed', 'quiz'), $attemptoptions);
 207         $mform->setDefault('attempts', $this->quiz->attempts);
 208
 209         // Submit buttons.
 210         $mform->addElement('submit', 'resetbutton',
 211                 get_string('reverttodefaults', 'quiz'));
 212
 213         $buttonarray = array();
 214         $buttonarray[] = $mform->createElement('submit', 'submitbutton',
 215                 get_string('save', 'quiz'));
 216         $buttonarray[] = $mform->createElement('submit', 'againbutton',
 217                 get_string('saveoverrideandstay', 'quiz'));
 218         $buttonarray[] = $mform->createElement('cancel');
 219
 220         $mform->addGroup($buttonarray, 'buttonbar', '', array(' '), false);
 221         $mform->closeHeaderBefore('buttonbar');
 222
 223     }
 224
 225     public function validation($data, $files) {
 226         global $COURSE, $DB;
 227         $errors = parent::validation($data, $files);
 228
 229         $mform =& $this->_form;
 230         $quiz = $this->quiz;
 231
 232         if ($mform->elementExists('userid')) {
 233             if (empty($data['userid'])) {
 234                 $errors['userid'] = get_string('required');
 235             }
 236         }
 237
 238         if ($mform->elementExists('groupid')) {
 239             if (empty($data['groupid'])) {
 240                 $errors['groupid'] = get_string('required');
 241             }
 242         }
 243
 244         // Ensure that the dates make sense.
 245         if (!empty($data['timeopen']) && !empty($data['timeclose'])) {
 246             if ($data['timeclose'] < $data['timeopen'] ) {
 247                 $errors['timeclose'] = get_string('closebeforeopen', 'quiz');
 248             }
 249         }
 250
 251         // Ensure that at least one quiz setting was changed.
 252         $changed = false;
 253         $keys = array('timeopen', 'timeclose', 'timelimit', 'attempts', 'password');
 254         foreach ($keys as $key) {
 255             if ($data[$key] != $quiz->{$key}) {
 256                 $changed = true;
 257                 break;
 258             }
 259         }
 260         if (!$changed) {
 261             $errors['timeopen'] = get_string('nooverridedata', 'quiz');
 262         }
 263
 264         return $errors;
 265     }
 266 }