admin/qtypes.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * Allows the admin to manage question types.
  20  *
  21  * @package    moodlecore
  22  * @subpackage questionbank
  23  * @copyright  2008 Tim Hunt
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27
  28 require_once(dirname(__FILE__) . '/../config.php');
  29 require_once($CFG->libdir . '/questionlib.php');
  30 require_once($CFG->libdir . '/adminlib.php');
  31 require_once($CFG->libdir . '/tablelib.php');
  32
  33 // Check permissions.
  34 require_login();
  35 $systemcontext = get_context_instance(CONTEXT_SYSTEM);
  36 require_capability('moodle/question:config', $systemcontext);
  37 $canviewreports = has_capability('report/questioninstances:view', $systemcontext);
  38
  39 admin_externalpage_setup('manageqtypes');
  40 $thispageurl = new moodle_url('/admin/qtypes.php');
  41
  42 $qtypes = question_bank::get_all_qtypes();
  43
  44 // Get some data we will need - question counts and which types are needed.
  45 $counts = $DB->get_records_sql("
  46         SELECT qtype, COUNT(1) as numquestions, SUM(hidden) as numhidden
  47         FROM {question} GROUP BY qtype", array());
  48 $needed = array();
  49 foreach ($qtypes as $qtypename => $qtype) {
  50     if (!isset($counts[$qtypename])) {
  51         $counts[$qtypename] = new stdClass;
  52         $counts[$qtypename]->numquestions = 0;
  53         $counts[$qtypename]->numhidden = 0;
  54     }
  55     $needed[$qtypename] = $counts[$qtypename]->numquestions > 0;
  56     $counts[$qtypename]->numquestions -= $counts[$qtypename]->numhidden;
  57 }
  58 $needed['missingtype'] = true; // The system needs the missing question type.
  59 foreach ($qtypes as $qtypename => $qtype) {
  60     foreach ($qtype->requires_qtypes() as $reqtype) {
  61         $needed[$reqtype] = true;
  62     }
  63 }
  64 foreach ($counts as $qtypename => $count) {
  65     if (!isset($qtypes[$qtypename])) {
  66         $counts['missingtype']->numquestions += $count->numquestions - $count->numhidden;
  67         $counts['missingtype']->numhidden += $count->numhidden;
  68     }
  69 }
  70
  71 // Work of the correct sort order.
  72 $config = get_config('question');
  73 $sortedqtypes = array();
  74 foreach ($qtypes as $qtypename => $qtype) {
  75     $sortedqtypes[$qtypename] = $qtype->local_name();
  76 }
  77 $sortedqtypes = question_bank::sort_qtype_array($sortedqtypes, $config);
  78
  79 // Process actions ============================================================
  80
  81 // Disable.
  82 if (($disable = optional_param('disable', '', PARAM_SAFEDIR)) && confirm_sesskey()) {
  83     if (!isset($qtypes[$disable])) {
  84         print_error('unknownquestiontype', 'question', $thispageurl, $disable);
  85     }
  86
  87     set_config($disable . '_disabled', 1, 'question');
  88     redirect($thispageurl);
  89 }
  90
  91 // Enable.
  92 if (($enable = optional_param('enable', '', PARAM_SAFEDIR)) && confirm_sesskey()) {
  93     if (!isset($qtypes[$enable])) {
  94         print_error('unknownquestiontype', 'question', $thispageurl, $enable);
  95     }
  96
  97     if (!$qtypes[$enable]->menu_name()) {
  98         print_error('cannotenable', 'question', $thispageurl, $enable);
  99     }
 100
 101     unset_config($enable . '_disabled', 'question');
 102     redirect($thispageurl);
 103 }
 104
 105 // Move up in order.
 106 if (($up = optional_param('up', '', PARAM_SAFEDIR)) && confirm_sesskey()) {
 107     if (!isset($qtypes[$up])) {
 108         print_error('unknownquestiontype', 'question', $thispageurl, $up);
 109     }
 110
 111     $neworder = question_reorder_qtypes($sortedqtypes, $up, -1);
 112     question_save_qtype_order($neworder, $config);
 113     redirect($thispageurl);
 114 }
 115
 116 // Move down in order.
 117 if (($down = optional_param('down', '', PARAM_SAFEDIR)) && confirm_sesskey()) {
 118     if (!isset($qtypes[$down])) {
 119         print_error('unknownquestiontype', 'question', $thispageurl, $down);
 120     }
 121
 122     $neworder = question_reorder_qtypes($sortedqtypes, $down, +1);
 123     question_save_qtype_order($neworder, $config);
 124     redirect($thispageurl);
 125 }
 126
 127 // Delete.
 128 if (($delete = optional_param('delete', '', PARAM_SAFEDIR)) && confirm_sesskey()) {
 129     // Check it is OK to delete this question type.
 130     if ($delete == 'missingtype') {
 131         print_error('cannotdeletemissingqtype', 'question', $thispageurl);
 132     }
 133
 134     if (!isset($qtypes[$delete])) {
 135         print_error('unknownquestiontype', 'question', $thispageurl, $delete);
 136     }
 137
 138     $qtypename = $qtypes[$delete]->local_name();
 139     if ($counts[$delete]->numquestions + $counts[$delete]->numhidden > 0) {
 140         print_error('cannotdeleteqtypeinuse', 'question', $thispageurl, $qtypename);
 141     }
 142
 143     if ($needed[$delete] > 0) {
 144         print_error('cannotdeleteqtypeneeded', 'question', $thispageurl, $qtypename);
 145     }
 146
 147     // If not yet confirmed, display a confirmation message.
 148     if (!optional_param('confirm', '', PARAM_BOOL)) {
 149         $qtypename = $qtypes[$delete]->local_name();
 150         echo $OUTPUT->header();
 151         echo $OUTPUT->heading(get_string('deleteqtypeareyousure', 'question', $qtypename));
 152         echo $OUTPUT->confirm(get_string('deleteqtypeareyousuremessage', 'question', $qtypename),
 153                 new moodle_url($thispageurl, array('delete' => $delete, 'confirm' => 1)),
 154                 $thispageurl);
 155         echo $OUTPUT->footer();
 156         exit;
 157     }
 158
 159     // Do the deletion.
 160     echo $OUTPUT->header();
 161     echo $OUTPUT->heading(get_string('deletingqtype', 'question', $qtypename));
 162
 163     // Delete any configuration records.
 164     if (!unset_all_config_for_plugin('qtype_' . $delete)) {
 165         echo $OUTPUT->notification(get_string('errordeletingconfig', 'admin', 'qtype_' . $delete));
 166     }
 167     unset_config($delete . '_disabled', 'question');
 168     unset_config($delete . '_sortorder', 'question');
 169
 170     // Then the tables themselves
 171     drop_plugin_tables($delete, $qtypes[$delete]->plugin_dir() . '/db/install.xml', false);
 172
 173     // Remove event handlers and dequeue pending events
 174     events_uninstall('qtype_' . $delete);
 175
 176     $a->qtype = $qtypename;
 177     $a->directory = $qtypes[$delete]->plugin_dir();
 178     echo $OUTPUT->box(get_string('qtypedeletefiles', 'question', $a), 'generalbox', 'notice');
 179     echo $OUTPUT->continue_button($thispageurl);
 180     echo $OUTPUT->footer();
 181     exit;
 182 }
 183
 184 // End of process actions ==================================================
 185
 186 // Print the page heading.
 187 echo $OUTPUT->header();
 188 echo $OUTPUT->heading(get_string('manageqtypes', 'admin'));
 189
 190 // Set up the table.
 191 $table = new flexible_table('qtypeadmintable');
 192 $table->define_baseurl($thispageurl);
 193 $table->define_columns(array('questiontype', 'numquestions', 'version', 'requires',
 194         'availableto', 'delete', 'settings'));
 195 $table->define_headers(array(get_string('questiontype', 'question'), get_string('numquestions', 'question'),
 196         get_string('version'), get_string('requires', 'admin'), get_string('availableq', 'question'),
 197         get_string('delete'), get_string('settings')));
 198 $table->set_attribute('id', 'qtypes');
 199 $table->set_attribute('class', 'generaltable generalbox boxaligncenter boxwidthwide');
 200 $table->setup();
 201
 202 // Add a row for each question type.
 203 $createabletypes = question_bank::get_creatable_qtypes();
 204 foreach ($sortedqtypes as $qtypename => $localname) {
 205     $qtype = $qtypes[$qtypename];
 206     $row = array();
 207
 208     // Question icon and name.
 209     $fakequestion = new stdClass;
 210     $fakequestion->qtype = $qtypename;
 211     $icon = print_question_icon($fakequestion, true);
 212     $row[] = $icon . ' ' . $localname;
 213
 214     // Number of questions of this type.
 215     if ($counts[$qtypename]->numquestions + $counts[$qtypename]->numhidden > 0) {
 216         if ($counts[$qtypename]->numhidden > 0) {
 217             $strcount = get_string('numquestionsandhidden', 'question', $counts[$qtypename]);
 218         } else {
 219             $strcount = $counts[$qtypename]->numquestions;
 220         }
 221         if ($canviewreports) {
 222             $row[] = html_writer::link(new moodle_url('/admin/report/questioninstances/index.php',
 223                     array('qtype' => $qtypename)), $strcount, array('title' => get_string('showdetails', 'admin')));
 224         } else {
 225             $strcount;
 226         }
 227     } else {
 228         $row[] = 0;
 229     }
 230
 231     // Question version number.
 232     $version = get_config('qtype_' . $qtypename, 'version');
 233     if ($version) {
 234         $row[] = $version;
 235     } else {
 236         $row[] = html_writer::tag('span', get_string('nodatabase', 'admin'), array('class' => 'disabled'));
 237     }
 238
 239     // Other question types required by this one.
 240     $requiredtypes = $qtype->requires_qtypes();
 241     $strtypes = array();
 242     if (!empty($requiredtypes)) {
 243         foreach ($requiredtypes as $required) {
 244             $strtypes[] = $qtypes[$required]->local_name();
 245         }
 246         $row[] = implode(', ', $strtypes);
 247     } else {
 248         $row[] = '';
 249     }
 250
 251     // Are people allowed to create new questions of this type?
 252     $rowclass = '';
 253     if ($qtype->menu_name()) {
 254         $createable = isset($createabletypes[$qtypename]);
 255         $icons = question_types_enable_disable_icons($qtypename, $createable);
 256         if (!$createable) {
 257             $rowclass = 'dimmed_text';
 258         }
 259     } else {
 260         $icons = $OUTPUT->spacer() . ' ';
 261     }
 262
 263     // Move icons.
 264     $icons .= question_type_icon_html('up', $qtypename, 't/up', get_string('up'), '');
 265     $icons .= question_type_icon_html('down', $qtypename, 't/down', get_string('down'), '');
 266     $row[] = $icons;
 267
 268     // Delete link, if available.
 269     if ($needed[$qtypename]) {
 270         $row[] = '';
 271     } else {
 272         $row[] = html_writer::link(new moodle_url($thispageurl,
 273                 array('delete' => $qtypename, 'sesskey' => sesskey())), get_string('delete'),
 274                 array('title' => get_string('uninstallqtype', 'question')));
 275     }
 276
 277     // Settings link, if available.
 278     $settings = admin_get_root()->locate('qtypesetting' . $qtypename);
 279     if ($settings instanceof admin_externalpage) {
 280         $row[] = html_writer::link($settings->url, get_string('settings'));
 281     } else if ($settings instanceof admin_settingpage) {
 282         $row[] = html_writer::link(new moodle_url('/admin/settings.php',
 283                 array('section' => 'qtypesetting' . $qtypename)), get_string('settings'));
 284     } else {
 285         $row[] = '';
 286     }
 287
 288     $table->add_data($row, $rowclass);
 289 }
 290
 291 $table->finish_output();
 292
 293 echo $OUTPUT->footer();
 294
 295 function question_types_enable_disable_icons($qtypename, $createable) {
 296     if ($createable) {
 297         return question_type_icon_html('disable', $qtypename, 'i/hide',
 298                 get_string('enabled', 'question'), get_string('disable'));
 299     } else {
 300         return question_type_icon_html('enable', $qtypename, 'i/show',
 301                 get_string('disabled', 'question'), get_string('enable'));
 302     }
 303 }
 304
 305 function question_type_icon_html($action, $qtypename, $icon, $alt, $tip) {
 306     global $OUTPUT;
 307     return $OUTPUT->action_icon(new moodle_url('/admin/qtypes.php',
 308             array($action => $qtypename, 'sesskey' => sesskey())),
 309             new pix_icon($icon, $alt, 'moodle', array('title' => '')),
 310             null, array('title' => $tip)) . ' ';
 311 }
 312