question/editlib.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  * Functions used to show question editing interface
  19  *
  20  * @package    moodlecore
  21  * @subpackage questionbank
  22  * @copyright  1999 onwards Martin Dougiamas and others {@link http://moodle.com}
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26
  27 use core_question\bank\search\category_condition;
  28
  29 defined('MOODLE_INTERNAL') || die();
  30
  31 require_once($CFG->libdir . '/questionlib.php');
  32
  33 define('DEFAULT_QUESTIONS_PER_PAGE', 20);
  34 define('MAXIMUM_QUESTIONS_PER_PAGE', 1000);
  35
  36 function get_module_from_cmid($cmid) {
  37     global $CFG, $DB;
  38     if (!$cmrec = $DB->get_record_sql("SELECT cm.*, md.name as modname
  39                                FROM {course_modules} cm,
  40                                     {modules} md
  41                                WHERE cm.id = ? AND
  42                                      md.id = cm.module", array($cmid))){
  43         print_error('invalidcoursemodule');
  44     } elseif (!$modrec =$DB->get_record($cmrec->modname, array('id' => $cmrec->instance))) {
  45         print_error('invalidcoursemodule');
  46     }
  47     $modrec->instance = $modrec->id;
  48     $modrec->cmid = $cmrec->id;
  49     $cmrec->name = $modrec->name;
  50
  51     return array($modrec, $cmrec);
  52 }
  53 /**
  54 * Function to read all questions for category into big array
  55 *
  56 * @param int $category category number
  57 * @param bool $noparent if true only questions with NO parent will be selected
  58 * @param bool $recurse include subdirectories
  59 * @param bool $export set true if this is called by questionbank export
  60 */
  61 function get_questions_category( $category, $noparent=false, $recurse=true, $export=true ) {
  62     global $DB;
  63
  64     // Build sql bit for $noparent
  65     $npsql = '';
  66     if ($noparent) {
  67       $npsql = " and parent='0' ";
  68     }
  69
  70     // Get list of categories
  71     if ($recurse) {
  72         $categorylist = question_categorylist($category->id);
  73     } else {
  74         $categorylist = array($category->id);
  75     }
  76
  77     // Get the list of questions for the category
  78     list($usql, $params) = $DB->get_in_or_equal($categorylist);
  79     $questions = $DB->get_records_select('question', "category {$usql} {$npsql}", $params, 'qtype, name');
  80
  81     // Iterate through questions, getting stuff we need
  82     $qresults = array();
  83     foreach($questions as $key => $question) {
  84         $question->export_process = $export;
  85         $qtype = question_bank::get_qtype($question->qtype, false);
  86         if ($export && $qtype->name() == 'missingtype') {
  87             // Unrecognised question type. Skip this question when exporting.
  88             continue;
  89         }
  90         $qtype->get_question_options($question);
  91         $qresults[] = $question;
  92     }
  93
  94     return $qresults;
  95 }
  96
  97 /**
  98  * @param int $categoryid a category id.
  99  * @return bool whether this is the only top-level category in a context.
 100  */
 101 function question_is_only_toplevel_category_in_context($categoryid) {
 102     global $DB;
 103     return 1 == $DB->count_records_sql("
 104             SELECT count(*)
 105               FROM {question_categories} c1,
 106                    {question_categories} c2
 107              WHERE c2.id = ?
 108                AND c1.contextid = c2.contextid
 109                AND c1.parent = 0 AND c2.parent = 0", array($categoryid));
 110 }
 111
 112 /**
 113  * Check whether this user is allowed to delete this category.
 114  *
 115  * @param int $todelete a category id.
 116  */
 117 function question_can_delete_cat($todelete) {
 118     global $DB;
 119     if (question_is_only_toplevel_category_in_context($todelete)) {
 120         print_error('cannotdeletecate', 'question');
 121     } else {
 122         $contextid = $DB->get_field('question_categories', 'contextid', array('id' => $todelete));
 123         require_capability('moodle/question:managecategory', context::instance_by_id($contextid));
 124     }
 125 }
 126
 127
 128 /**
 129  * Base class for representing a column in a {@link question_bank_view}.
 130  *
 131  * @copyright  2009 Tim Hunt
 132  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 133  * @deprecated since Moodle 2.7 MDL-40457
 134  */
 135 class_alias('core_question\bank\column_base', 'question_bank_column_base', true);
 136
 137 /**
 138  * A column with a checkbox for each question with name q{questionid}.
 139  *
 140  * @copyright  2009 Tim Hunt
 141  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 142  * @deprecated since Moodle 2.7 MDL-40457
 143  */
 144 class_alias('core_question\bank\checkbox_column', 'question_bank_checkbox_column', true);
 145
 146 /**
 147  * A column type for the name of the question type.
 148  *
 149  * @copyright  2009 Tim Hunt
 150  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 151  * @deprecated since Moodle 2.7 MDL-40457
 152  */
 153 class_alias('core_question\bank\question_type_column', 'question_bank_question_type_column', true);
 154
 155
 156 /**
 157  * A column type for the name of the question name.
 158  *
 159  * @copyright  2009 Tim Hunt
 160  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 161  * @deprecated since Moodle 2.7 MDL-40457
 162  */
 163 class_alias('core_question\bank\question_name_column', 'question_bank_question_name_column', true);
 164
 165
 166 /**
 167  * A column type for the name of the question creator.
 168  *
 169  * @copyright  2009 Tim Hunt
 170  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 171  * @deprecated since Moodle 2.7 MDL-40457
 172  */
 173 class_alias('core_question\bank\creator_name_column', 'question_bank_creator_name_column', true);
 174
 175
 176 /**
 177  * A column type for the name of the question last modifier.
 178  *
 179  * @copyright  2009 Tim Hunt
 180  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 181  * @deprecated since Moodle 2.7 MDL-40457
 182  */
 183 class_alias('core_question\bank\modifier_name_column', 'question_bank_modifier_name_column', true);
 184
 185
 186 /**
 187  * A base class for actions that are an icon that lets you manipulate the question in some way.
 188  *
 189  * @copyright  2009 Tim Hunt
 190  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 191  * @deprecated since Moodle 2.7 MDL-40457
 192  */
 193 class_alias('core_question\bank\action_column_base', 'question_bank_action_column_base', true);
 194
 195
 196 /**
 197  * Base class for question bank columns that just contain an action icon.
 198  *
 199  * @copyright  2009 Tim Hunt
 200  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 201  * @deprecated since Moodle 2.7 MDL-40457
 202  */
 203 class_alias('core_question\bank\edit_action_column', 'question_bank_edit_action_column', true);
 204
 205 /**
 206  * Question bank column for the duplicate action icon.
 207  *
 208  * @copyright  2013 The Open University
 209  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 210  * @deprecated since Moodle 2.7 MDL-40457
 211  */
 212 class_alias('core_question\bank\copy_action_column', 'question_bank_copy_action_column', true);
 213
 214 /**
 215  * Question bank columns for the preview action icon.
 216  *
 217  * @copyright  2009 Tim Hunt
 218  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 219  * @deprecated since Moodle 2.7 MDL-40457
 220  */
 221 class_alias('core_question\bank\preview_action_column', 'question_bank_preview_action_column', true);
 222
 223
 224 /**
 225  * action to delete (or hide) a question, or restore a previously hidden question.
 226  *
 227  * @copyright  2009 Tim Hunt
 228  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 229  * @deprecated since Moodle 2.7 MDL-40457
 230  */
 231 class_alias('core_question\bank\delete_action_column', 'question_bank_delete_action_column', true);
 232
 233 /**
 234  * Base class for 'columns' that are actually displayed as a row following the main question row.
 235  *
 236  * @copyright  2009 Tim Hunt
 237  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 238  * @deprecated since Moodle 2.7 MDL-40457
 239  */
 240 class_alias('core_question\bank\row_base', 'question_bank_row_base', true);
 241
 242 /**
 243  * A column type for the name of the question name.
 244  *
 245  * @copyright  2009 Tim Hunt
 246  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 247  * @deprecated since Moodle 2.7 MDL-40457
 248  */
 249 class_alias('core_question\bank\question_text_row', 'question_bank_question_text_row', true);
 250
 251 /**
 252  * @copyright  2009 Tim Hunt
 253  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 254  * @deprecated since Moodle 2.7 MDL-40457
 255  */
 256 class_alias('core_question\bank\view', 'question_bank_view', true);
 257
 258 /**
 259  * Common setup for all pages for editing questions.
 260  * @param string $baseurl the name of the script calling this funciton. For examle 'qusetion/edit.php'.
 261  * @param string $edittab code for this edit tab
 262  * @param bool $requirecmid require cmid? default false
 263  * @param bool $requirecourseid require courseid, if cmid is not given? default true
 264  * @return array $thispageurl, $contexts, $cmid, $cm, $module, $pagevars
 265  */
 266 function question_edit_setup($edittab, $baseurl, $requirecmid = false, $requirecourseid = true) {
 267     global $DB, $PAGE;
 268
 269     $thispageurl = new moodle_url($baseurl);
 270     $thispageurl->remove_all_params(); // We are going to explicity add back everything important - this avoids unwanted params from being retained.
 271
 272     if ($requirecmid){
 273         $cmid =required_param('cmid', PARAM_INT);
 274     } else {
 275         $cmid = optional_param('cmid', 0, PARAM_INT);
 276     }
 277     if ($cmid){
 278         list($module, $cm) = get_module_from_cmid($cmid);
 279         $courseid = $cm->course;
 280         $thispageurl->params(compact('cmid'));
 281         require_login($courseid, false, $cm);
 282         $thiscontext = context_module::instance($cmid);
 283     } else {
 284         $module = null;
 285         $cm = null;
 286         if ($requirecourseid){
 287             $courseid  = required_param('courseid', PARAM_INT);
 288         } else {
 289             $courseid  = optional_param('courseid', 0, PARAM_INT);
 290         }
 291         if ($courseid){
 292             $thispageurl->params(compact('courseid'));
 293             require_login($courseid, false);
 294             $thiscontext = context_course::instance($courseid);
 295         } else {
 296             $thiscontext = null;
 297         }
 298     }
 299
 300     if ($thiscontext){
 301         $contexts = new question_edit_contexts($thiscontext);
 302         $contexts->require_one_edit_tab_cap($edittab);
 303
 304     } else {
 305         $contexts = null;
 306     }
 307
 308     $PAGE->set_pagelayout('admin');
 309
 310     $pagevars['qpage'] = optional_param('qpage', -1, PARAM_INT);
 311
 312     //pass 'cat' from page to page and when 'category' comes from a drop down menu
 313     //then we also reset the qpage so we go to page 1 of
 314     //a new cat.
 315     $pagevars['cat'] = optional_param('cat', 0, PARAM_SEQUENCE); // if empty will be set up later
 316     if ($category = optional_param('category', 0, PARAM_SEQUENCE)) {
 317         if ($pagevars['cat'] != $category) { // is this a move to a new category?
 318             $pagevars['cat'] = $category;
 319             $pagevars['qpage'] = 0;
 320         }
 321     }
 322     if ($pagevars['cat']){
 323         $thispageurl->param('cat', $pagevars['cat']);
 324     }
 325     if (strpos($baseurl, '/question/') === 0) {
 326         navigation_node::override_active_url($thispageurl);
 327     }
 328
 329     if ($pagevars['qpage'] > -1) {
 330         $thispageurl->param('qpage', $pagevars['qpage']);
 331     } else {
 332         $pagevars['qpage'] = 0;
 333     }
 334
 335     $pagevars['qperpage'] = question_get_display_preference(
 336             'qperpage', DEFAULT_QUESTIONS_PER_PAGE, PARAM_INT, $thispageurl);
 337
 338     for ($i = 1; $i <= question_bank_view::MAX_SORTS; $i++) {
 339         $param = 'qbs' . $i;
 340         if (!$sort = optional_param($param, '', PARAM_TEXT)) {
 341             break;
 342         }
 343         $thispageurl->param($param, $sort);
 344     }
 345
 346     $defaultcategory = question_make_default_categories($contexts->all());
 347
 348     $contextlistarr = array();
 349     foreach ($contexts->having_one_edit_tab_cap($edittab) as $context){
 350         $contextlistarr[] = "'{$context->id}'";
 351     }
 352     $contextlist = join($contextlistarr, ' ,');
 353     if (!empty($pagevars['cat'])){
 354         $catparts = explode(',', $pagevars['cat']);
 355         if (!$catparts[0] || (false !== array_search($catparts[1], $contextlistarr)) ||
 356                 !$DB->count_records_select("question_categories", "id = ? AND contextid = ?", array($catparts[0], $catparts[1]))) {
 357             print_error('invalidcategory', 'question');
 358         }
 359     } else {
 360         $category = $defaultcategory;
 361         $pagevars['cat'] = "{$category->id},{$category->contextid}";
 362     }
 363
 364     // Display options.
 365     $pagevars['recurse']    = question_get_display_preference('recurse',    1, PARAM_BOOL, $thispageurl);
 366     $pagevars['showhidden'] = question_get_display_preference('showhidden', 0, PARAM_BOOL, $thispageurl);
 367     $pagevars['qbshowtext'] = question_get_display_preference('qbshowtext', 0, PARAM_BOOL, $thispageurl);
 368
 369     // Category list page.
 370     $pagevars['cpage'] = optional_param('cpage', 1, PARAM_INT);
 371     if ($pagevars['cpage'] != 1){
 372         $thispageurl->param('cpage', $pagevars['cpage']);
 373     }
 374
 375     return array($thispageurl, $contexts, $cmid, $cm, $module, $pagevars);
 376 }
 377
 378 /**
 379  * Get the category id from $pagevars.
 380  * @param array $pagevars from {@link question_edit_setup()}.
 381  * @return int the category id.
 382  */
 383 function question_get_category_id_from_pagevars(array $pagevars) {
 384     list($questioncategoryid) = explode(',', $pagevars['cat']);
 385     return $questioncategoryid;
 386 }
 387
 388 /**
 389  * Get a particular question preference that is also stored as a user preference.
 390  * If the the value is given in the GET/POST request, then that value is used,
 391  * and the user preference is updated to that value. Otherwise, the last set
 392  * value of the user preference is used, or if it has never been set the default
 393  * passed to this function.
 394  *
 395  * @param string $param the param name. The URL parameter set, and the GET/POST
 396  *      parameter read. The user_preference name is 'question_bank_' . $param.
 397  * @param mixed $default The default value to use, if not otherwise set.
 398  * @param int $type one of the PARAM_... constants.
 399  * @param moodle_url $thispageurl if the value has been explicitly set, we add
 400  *      it to this URL.
 401  * @return mixed the parameter value to use.
 402  */
 403 function question_get_display_preference($param, $default, $type, $thispageurl) {
 404     $submittedvalue = optional_param($param, null, $type);
 405     if (is_null($submittedvalue)) {
 406         return get_user_preferences('question_bank_' . $param, $default);
 407     }
 408
 409     set_user_preference('question_bank_' . $param, $submittedvalue);
 410     $thispageurl->param($param, $submittedvalue);
 411     return $submittedvalue;
 412 }
 413
 414 /**
 415  * Make sure user is logged in as required in this context.
 416  */
 417 function require_login_in_context($contextorid = null){
 418     global $DB, $CFG;
 419     if (!is_object($contextorid)){
 420         $context = context::instance_by_id($contextorid, IGNORE_MISSING);
 421     } else {
 422         $context = $contextorid;
 423     }
 424     if ($context && ($context->contextlevel == CONTEXT_COURSE)) {
 425         require_login($context->instanceid);
 426     } else if ($context && ($context->contextlevel == CONTEXT_MODULE)) {
 427         if ($cm = $DB->get_record('course_modules',array('id' =>$context->instanceid))) {
 428             if (!$course = $DB->get_record('course', array('id' => $cm->course))) {
 429                 print_error('invalidcourseid');
 430             }
 431             require_course_login($course, true, $cm);
 432
 433         } else {
 434             print_error('invalidcoursemodule');
 435         }
 436     } else if ($context && ($context->contextlevel == CONTEXT_SYSTEM)) {
 437         if (!empty($CFG->forcelogin)) {
 438             require_login();
 439         }
 440
 441     } else {
 442         require_login();
 443     }
 444 }
 445
 446 /**
 447  * Print a form to let the user choose which question type to add.
 448  * When the form is submitted, it goes to the question.php script.
 449  * @param $hiddenparams hidden parameters to add to the form, in addition to
 450  *      the qtype radio buttons.
 451  * @param $allowedqtypes optional list of qtypes that are allowed. If given, only
 452  *      those qtypes will be shown. Example value array('description', 'multichoice').
 453  */
 454 function print_choose_qtype_to_add_form($hiddenparams, array $allowedqtypes = null, $enablejs = true) {
 455     global $CFG, $PAGE, $OUTPUT;
 456
 457     if ($enablejs) {
 458         // Add the chooser.
 459         $PAGE->requires->yui_module('moodle-question-chooser', 'M.question.init_chooser', array(array()));
 460     }
 461
 462     $realqtypes = array();
 463     $fakeqtypes = array();
 464     foreach (question_bank::get_creatable_qtypes() as $qtypename => $qtype) {
 465         if ($allowedqtypes && !in_array($qtypename, $allowedqtypes)) {
 466             continue;
 467         }
 468         if ($qtype->is_real_question_type()) {
 469             $realqtypes[] = $qtype;
 470         } else {
 471             $fakeqtypes[] = $qtype;
 472         }
 473     }
 474
 475     $renderer = $PAGE->get_renderer('question', 'bank');
 476     return $renderer->qbank_chooser($realqtypes, $fakeqtypes, $PAGE->course, $hiddenparams);
 477 }
 478
 479 /**
 480  * Print a button for creating a new question. This will open question/addquestion.php,
 481  * which in turn goes to question/question.php before getting back to $params['returnurl']
 482  * (by default the question bank screen).
 483  *
 484  * @param int $categoryid The id of the category that the new question should be added to.
 485  * @param array $params Other paramters to add to the URL. You need either $params['cmid'] or
 486  *      $params['courseid'], and you should probably set $params['returnurl']
 487  * @param string $caption the text to display on the button.
 488  * @param string $tooltip a tooltip to add to the button (optional).
 489  * @param bool $disabled if true, the button will be disabled.
 490  */
 491 function create_new_question_button($categoryid, $params, $caption, $tooltip = '', $disabled = false) {
 492     global $CFG, $PAGE, $OUTPUT;
 493     static $choiceformprinted = false;
 494     $params['category'] = $categoryid;
 495     $url = new moodle_url('/question/addquestion.php', $params);
 496     echo $OUTPUT->single_button($url, $caption, 'get', array('disabled'=>$disabled, 'title'=>$tooltip));
 497
 498     if (!$choiceformprinted) {
 499         echo '<div id="qtypechoicecontainer">';
 500         echo print_choose_qtype_to_add_form(array());
 501         echo "</div>\n";
 502         $choiceformprinted = true;
 503     }
 504 }
 505
 506