moodle/question/editlib.php
2008-07-24 04:20:44 +00:00

904 lines
37 KiB
PHP

<?php // $Id$
/**
* Functions used to show question editing interface
*
*
* @author Martin Dougiamas and many others. This has recently been extensively
* rewritten by members of the Serving Mathematics project
* {@link http://maths.york.ac.uk/serving_maths}
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package questionbank
*/
require_once($CFG->libdir.'/questionlib.php');
define('DEFAULT_QUESTIONS_PER_PAGE', 20);
function get_module_from_cmid($cmid){
global $CFG, $DB;
if (!$cmrec = $DB->get_record_sql("SELECT cm.*, md.name as modname
FROM {course_modules} cm,
{modules} md
WHERE cm.id = ? AND
md.id = cm.module", array($cmid))){
print_error('cmunknown');
} elseif (!$modrec =$DB->get_record($cmrec->modname, array('id' => $cmrec->instance))) {
print_error('cmunknown');
}
$modrec->instance = $modrec->id;
$modrec->cmid = $cmrec->id;
$cmrec->name = $modrec->name;
return array($modrec, $cmrec);
}
/**
* Function to read all questions for category into big array
*
* @param int $category category number
* @param bool $noparent if true only questions with NO parent will be selected
* @param bool $recurse include subdirectories
* @param bool $export set true if this is called by questionbank export
* @author added by Howard Miller June 2004
*/
function get_questions_category( $category, $noparent=false, $recurse=true, $export=true ) {
global $QTYPES, $DB;
// questions will be added to an array
$qresults = array();
// build sql bit for $noparent
$npsql = '';
if ($noparent) {
$npsql = " and parent='0' ";
}
// get (list) of categories
if ($recurse) {
$categorylist = question_categorylist( $category->id );
}
else {
$categorylist = $category->id;
}
// get the list of questions for the category
list ($usql, $params) = $DB->get_in_or_equal(explode(',', $categorylist));
if ($questions = $DB->get_records_select("question","category $usql $npsql", $params, "qtype, name ASC")) {
// iterate through questions, getting stuff we need
foreach($questions as $question) {
$questiontype = $QTYPES[$question->qtype];
$question->export_process = $export;
$questiontype->get_question_options( $question );
$qresults[] = $question;
}
}
return $qresults;
}
function question_can_delete_cat($todelete){
global $CFG, $DB;
$record = $DB->get_record_sql("SELECT count(*) as count, c1.contextid as contextid FROM {question_categories} c1,
{question_categories} c2 WHERE c2.id = ?
AND c1.contextid = c2.contextid GROUP BY c1.contextid", array($todelete));
$contextid = $record->contextid;
$count = $record->count;
if ($count < 2) {
print_error('cannotdeletecate', 'question');
} else {
require_capability('moodle/question:managecategory', get_context_instance_by_id($contextid));
}
}
/**
* prints a form to choose categories
*/
function question_category_form($contexts, $pageurl, $current, $recurse=1, $showhidden=false, $showquestiontext=false) {
global $CFG;
/// Get all the existing categories now
$catmenu = question_category_options($contexts, false, 0, true);
$strcategory = get_string('category', 'quiz');
$strshow = get_string('show', 'quiz');
$streditcats = get_string('editcategories', 'quiz');
popup_form ('edit.php?'.$pageurl->get_query_string().'&amp;category=', $catmenu, 'catmenu', $current, '', '', '', false, 'self', "<strong>$strcategory</strong>");
echo '<form method="get" action="edit.php" id="displayoptions">';
echo "<fieldset class='invisiblefieldset'>";
echo $pageurl->hidden_params_out(array('recurse', 'showhidden', 'showquestiontext'));
question_category_form_checkbox('recurse', $recurse);
question_category_form_checkbox('showhidden', $showhidden);
question_category_form_checkbox('showquestiontext', $showquestiontext);
echo '<noscript><div class="centerpara"><input type="submit" value="'. get_string('go') .'" />';
echo '</div></noscript></fieldset></form>';
}
/**
* Private funciton to help the preceeding function.
*/
function question_category_form_checkbox($name, $checked) {
echo '<div><input type="hidden" id="' . $name . '_off" name="' . $name . '" value="0" />';
echo '<input type="checkbox" id="' . $name . '_on" name="' . $name . '" value="1"';
if ($checked) {
echo ' checked="checked"';
}
echo ' onchange="getElementById(\'displayoptions\').submit(); return true;" />';
echo '<label for="' . $name . '_on">';
print_string($name, 'quiz');
echo "</label></div>\n";
}
/**
* Prints the table of questions in a category with interactions
*
* @param object $course The course object
* @param int $categoryid The id of the question category to be displayed
* @param int $cm The course module record if we are in the context of a particular module, 0 otherwise
* @param int $recurse This is 1 if subcategories should be included, 0 otherwise
* @param int $page The number of the page to be displayed
* @param int $perpage Number of questions to show per page
* @param boolean $showhidden True if also hidden questions should be displayed
* @param boolean $showquestiontext whether the text of each question should be shown in the list
*/
function question_list($contexts, $pageurl, $categoryandcontext, $cm = null,
$recurse=1, $page=0, $perpage=100, $showhidden=false, $sortorder='typename', $sortorderdecoded='qtype, name ASC',
$showquestiontext = false, $addcontexts = array()) {
global $USER, $CFG, $THEME, $COURSE, $DB;
list($categoryid, $contextid)= explode(',', $categoryandcontext);
$qtypemenu = question_type_menu();
$strcategory = get_string("category", "quiz");
$strquestion = get_string("question", "quiz");
$straddquestions = get_string("addquestions", "quiz");
$strimportquestions = get_string("importquestions", "quiz");
$strexportquestions = get_string("exportquestions", "quiz");
$strnoquestions = get_string("noquestions", "quiz");
$strselect = get_string("select", "quiz");
$strselectall = get_string("selectall", "quiz");
$strselectnone = get_string("selectnone", "quiz");
$strcreatenewquestion = get_string("createnewquestion", "quiz");
$strquestionname = get_string("questionname", "quiz");
$strdelete = get_string("delete");
$stredit = get_string("edit");
$strmove = get_string('moveqtoanothercontext', 'question');
$strview = get_string("view");
$straction = get_string("action");
$strrestore = get_string('restore');
$strtype = get_string("type", "quiz");
$strcreatemultiple = get_string("createmultiple", "quiz");
$strpreview = get_string("preview","quiz");
if (!$categoryid) {
echo "<p style=\"text-align:center;\"><b>";
print_string("selectcategoryabove", "quiz");
echo "</b></p>";
return;
}
if (!$category = $DB->get_record('question_categories', array('id' => $categoryid, 'contextid' => $contextid))) {
notify('Category not found!');
return;
}
$catcontext = get_context_instance_by_id($contextid);
$canadd = has_capability('moodle/question:add', $catcontext);
//check for capabilities on all questions in category, will also apply to sub cats.
$caneditall =has_capability('moodle/question:editall', $catcontext);
$canuseall =has_capability('moodle/question:useall', $catcontext);
$canmoveall =has_capability('moodle/question:moveall', $catcontext);
if ($cm AND $cm->modname == 'quiz') {
$quizid = $cm->instance;
} else {
$quizid = 0;
}
$returnurl = $pageurl->out();
$questionurl = new moodle_url("$CFG->wwwroot/question/question.php",
array('returnurl' => $returnurl));
if ($cm!==null){
$questionurl->param('cmid', $cm->id);
} else {
$questionurl->param('courseid', $COURSE->id);
}
$questionmoveurl = new moodle_url("$CFG->wwwroot/question/contextmoveq.php",
array('returnurl' => $returnurl));
if ($cm!==null){
$questionmoveurl->param('cmid', $cm->id);
} else {
$questionmoveurl->param('courseid', $COURSE->id);
}
echo '<div class="boxaligncenter">';
$formatoptions = new stdClass;
$formatoptions->noclean = true;
echo format_text($category->info, FORMAT_MOODLE, $formatoptions, $COURSE->id);
echo '<table><tr>';
if ($canadd) {
echo '<td valign="top" align="right">';
popup_form ($questionurl->out(false, array('category' => $category->id)).'&amp;qtype=', $qtypemenu, "addquestion", "", "choose", "", "", false, "self", "<strong>$strcreatenewquestion</strong>");
echo '</td><td valign="top" align="right">';
helpbutton("questiontypes", $strcreatenewquestion, "quiz");
echo '</td>';
}
else {
echo '<td>';
print_string('nopermissionadd', 'question');
echo '</td>';
}
echo '</tr></table>';
echo '</div>';
$categorylist = ($recurse) ? question_categorylist($category->id) : $category->id;
// hide-feature
$showhidden = $showhidden ? '' : " AND hidden = '0'";
$categorylist_array = explode(',', $categorylist);
list($usql, $params) = $DB->get_in_or_equal($categorylist_array);
if (!$totalnumber = $DB->count_records_select('question', "category $usql AND parent = '0' $showhidden", $params)) {
echo "<p style=\"text-align:center;\">";
print_string("noquestions", "quiz");
echo "</p>";
return;
}
if (!$questions = $DB->get_records_select('question', "category $usql AND parent = '0' $showhidden", $params, $sortorderdecoded, '*', $page*$perpage, $perpage)) {
// There are no questions on the requested page.
$page = 0;
if (!$questions = $DB->get_records_select('question', "category $usql AND parent = '0' $showhidden", $params, $sortorderdecoded, '*', 0, $perpage)) {
// There are no questions at all
echo "<p style=\"text-align:center;\">";
print_string("noquestions", "quiz");
echo "</p>";
return;
}
}
print_paging_bar($totalnumber, $page, $perpage, $pageurl, 'qpage');
echo question_sort_options($pageurl, $sortorder);
echo '<form method="post" action="edit.php">';
echo '<fieldset class="invisiblefieldset" style="display: block;">';
echo '<input type="hidden" name="sesskey" value="'.$USER->sesskey.'" />';
echo $pageurl->hidden_params_out();
echo '<table id="categoryquestions" style="width: 100%"><tr>';
echo "<th style=\"white-space:nowrap;\" class=\"header\" scope=\"col\">$straction</th>";
echo "<th style=\"white-space:nowrap; text-align: left;\" class=\"header\" scope=\"col\">$strquestionname</th>
<th style=\"white-space:nowrap; text-align: right;\" class=\"header\" scope=\"col\">$strtype</th>";
echo "</tr>\n";
foreach ($questions as $question) {
$nameclass = '';
$textclass = '';
if ($question->hidden) {
$nameclass = 'dimmed_text';
$textclass = 'dimmed_text';
}
if ($showquestiontext) {
$nameclass .= ' header';
}
if ($nameclass) {
$nameclass = 'class="' . $nameclass . '"';
}
if ($textclass) {
$textclass = 'class="' . $textclass . '"';
}
echo "<tr>\n<td style=\"white-space:nowrap;\" $nameclass>\n";
$canuseq = question_has_capability_on($question, 'use', $question->category);
if (function_exists('module_specific_actions')) {
echo module_specific_actions($pageurl, $question->id, $cm->id, $canuseq);
}
// preview
if ($canuseq) {
$quizorcourseid = $quizid?('&amp;quizid=' . $quizid):('&amp;courseid=' .$COURSE->id);
link_to_popup_window('/question/preview.php?id=' . $question->id . $quizorcourseid, 'questionpreview',
"<img src=\"$CFG->pixpath/t/preview.gif\" class=\"iconsmall\" alt=\"$strpreview\" />",
0, 0, $strpreview, QUESTION_PREVIEW_POPUP_OPTIONS);
}
// edit, hide, delete question, using question capabilities, not quiz capabilieies
if (question_has_capability_on($question, 'edit', $question->category) || question_has_capability_on($question, 'move', $question->category)) {
echo "<a title=\"$stredit\" href=\"".$questionurl->out(false, array('id'=>$question->id))."\"><img
src=\"$CFG->pixpath/t/edit.gif\" alt=\"$stredit\" /></a>&nbsp;";
} elseif (question_has_capability_on($question, 'view', $question->category)){
echo "<a title=\"$strview\" href=\"".$questionurl->out(false, array('id'=>$question->id))."\"><img
src=\"$CFG->pixpath/i/info.gif\" alt=\"$strview\" /></a>&nbsp;";
}
if (question_has_capability_on($question, 'move', $question->category) && question_has_capability_on($question, 'view', $question->category)) {
echo "<a title=\"$strmove\" href=\"".$questionurl->out(false, array('id'=>$question->id, 'movecontext'=>1))."\"><img
src=\"$CFG->pixpath/t/move.gif\" alt=\"$strmove\" /></a>&nbsp;";
}
if (question_has_capability_on($question, 'edit', $question->category)) {
// hide-feature
if($question->hidden) {
echo "<a title=\"$strrestore\" href=\"edit.php?".$pageurl->get_query_string()."&amp;unhide=$question->id&amp;sesskey=$USER->sesskey\"><img
src=\"$CFG->pixpath/t/restore.gif\" alt=\"$strrestore\" /></a>";
} else {
echo "<a title=\"$strdelete\" href=\"edit.php?".$pageurl->get_query_string()."&amp;deleteselected=$question->id&amp;q$question->id=1\"><img
src=\"$CFG->pixpath/t/delete.gif\" alt=\"$strdelete\" /></a>";
}
}
if ($caneditall || $canmoveall || $canuseall){
echo "&nbsp;<input title=\"$strselect\" type=\"checkbox\" name=\"q$question->id\" value=\"1\" />";
}
echo "</td>\n";
echo "<td $nameclass>" . format_string($question->name) . "</td>\n";
echo "<td $nameclass style='text-align: right'>\n";
print_question_icon($question);
echo "</td>\n";
echo "</tr>\n";
if($showquestiontext){
echo '<tr><td colspan="3" ' . $textclass . '>';
$formatoptions = new stdClass;
$formatoptions->noclean = true;
$formatoptions->para = false;
echo format_text($question->questiontext, $question->questiontextformat,
$formatoptions, $COURSE->id);
echo "</td></tr>\n";
}
}
echo "</table>\n";
$paging = print_paging_bar($totalnumber, $page, $perpage, $pageurl, 'qpage', false, true);
if ($totalnumber > DEFAULT_QUESTIONS_PER_PAGE) {
if ($perpage == DEFAULT_QUESTIONS_PER_PAGE) {
$showall = '<a href="edit.php?'.$pageurl->get_query_string(array('qperpage'=>1000)).'">'.get_string('showall', 'moodle', $totalnumber).'</a>';
} else {
$showall = '<a href="edit.php?'.$pageurl->get_query_string(array('qperpage'=>DEFAULT_QUESTIONS_PER_PAGE)).'">'.get_string('showperpage', 'moodle', DEFAULT_QUESTIONS_PER_PAGE).'</a>';
}
if ($paging) {
$paging = substr($paging, 0, strrpos($paging, '</div>'));
$paging .= "<br />$showall</div>";
} else {
$paging = "<div class='paging'>$showall</div>";
}
}
echo $paging;
if ($caneditall || $canmoveall || $canuseall){
echo '<a href="javascript:select_all_in(\'TABLE\',null,\'categoryquestions\');">'.$strselectall.'</a> /'.
' <a href="javascript:deselect_all_in(\'TABLE\',null,\'categoryquestions\');">'.$strselectnone.'</a>';
echo '<br />';
echo '<strong>&nbsp;'.get_string('withselected', 'quiz').':</strong><br />';
if (function_exists('module_specific_buttons')) {
echo module_specific_buttons($cm->id);
}
// print delete and move selected question
if ($caneditall) {
echo '<input type="submit" name="deleteselected" value="'.$strdelete."\" />\n";
}
if ($canmoveall && count($addcontexts)) {
echo '<input type="submit" name="move" value="'.get_string('moveto', 'quiz')."\" />\n";
question_category_select_menu($addcontexts, false, 0, "$category->id,$category->contextid");
}
if (function_exists('module_specific_controls') && $canuseall) {
echo module_specific_controls($totalnumber, $recurse, $category, $cm->id);
}
}
echo '</fieldset>';
echo "</form>\n";
}
function question_sort_options($pageurl, $sortorder){
global $USER;
//sort options
$html = "<div class=\"mdl-align\">";
$html .= '<form method="post" action="edit.php">';
$html .= '<fieldset class="invisiblefieldset" style="display: block;">';
$html .= '<input type="hidden" name="sesskey" value="'.$USER->sesskey.'" />';
$html .= $pageurl->hidden_params_out(array('qsortorder'));
$sortoptions = array('alpha' => get_string("sortalpha", "quiz"),
'typealpha' => get_string("sorttypealpha", "quiz"),
'age' => get_string("sortage", "quiz"));
$html .= choose_from_menu ($sortoptions, 'qsortorder', $sortorder, false, 'this.form.submit();', '0', true);
$html .= '<noscript><div><input type="submit" value="'.get_string("sortsubmit", "quiz").'" /></div></noscript>';
$html .= '</fieldset>';
$html .= "</form>\n";
$html .= "</div>\n";
return $html;
}
function question_showbank_actions($pageurl, $cm){
global $CFG, $COURSE, $DB;
/// Now, check for commands on this page and modify variables as necessary
if (optional_param('move', false, PARAM_BOOL) and confirm_sesskey()) { /// Move selected questions to new category
$category = required_param('category', PARAM_SEQUENCE);
list($tocategoryid, $contextid) = explode(',', $category);
if (! $tocategory = $DB->get_record('question_categories', array('id' => $tocategoryid, 'contextid' => $contextid))) {
print_error('cannotfindcate', 'question');
}
$tocontext = get_context_instance_by_id($contextid);
require_capability('moodle/question:add', $tocontext);
$rawdata = (array) data_submitted();
$questionids = array();
foreach ($rawdata as $key => $value) { // Parse input for question ids
if (preg_match('!^q([0-9]+)$!', $key, $matches)) {
$key = $matches[1];
$questionids[] = $key;
}
}
if ($questionids){
list($usql, $params) = $DB->get_in_or_equal($questionids);
$sql = "SELECT q.*, c.contextid FROM {question} q, {question_categories} c WHERE q.id $usql AND c.id = q.category";
if (!$questions = $DB->get_records_sql($sql, $params)){
print_error('questiondoesnotexist', 'question', $pageurl->out());
}
$checkforfiles = false;
foreach ($questions as $question){
//check capabilities
question_require_capability_on($question, 'move');
$fromcontext = get_context_instance_by_id($question->contextid);
if (get_filesdir_from_context($fromcontext) != get_filesdir_from_context($tocontext)){
$checkforfiles = true;
}
}
$returnurl = $pageurl->out(false, array('category'=>"$tocategoryid,$contextid"));
if (!$checkforfiles){
if (!question_move_questions_to_category(implode(',', $questionids), $tocategory->id)) {
print_error('errormovingquestions', 'question', $returnurl, $questionids);
}
redirect($returnurl);
} else {
$movecontexturl = new moodle_url($CFG->wwwroot.'/question/contextmoveq.php',
array('returnurl' => $returnurl,
'ids'=>$questionidlist,
'tocatid'=> $tocategoryid));
if ($cm){
$movecontexturl->param('cmid', $cm->id);
} else {
$movecontexturl->param('courseid', $COURSE->id);
}
redirect($movecontexturl->out());
}
}
}
if (optional_param('deleteselected', false, PARAM_BOOL)) { // delete selected questions from the category
if (($confirm = optional_param('confirm', '', PARAM_ALPHANUM)) and confirm_sesskey()) { // teacher has already confirmed the action
$deleteselected = required_param('deleteselected');
if ($confirm == md5($deleteselected)) {
if ($questionlist = explode(',', $deleteselected)) {
// for each question either hide it if it is in use or delete it
foreach ($questionlist as $questionid) {
question_require_capability_on($questionid, 'edit');
if ($DB->record_exists('quiz_question_instances', array('question' => $questionid))) {
if (!$DB->set_field('question', 'hidden', 1, array('id', $questionid))) {
question_require_capability_on($questionid, 'edit');
print_error('cannothidequestion', 'question');
}
} else {
delete_question($questionid);
}
}
}
redirect($pageurl->out());
} else {
print_error('invalidconfirm', 'question');
}
}
}
// Unhide a question
if(($unhide = optional_param('unhide', '', PARAM_INT)) and confirm_sesskey()) {
question_require_capability_on($unhide, 'edit');
if(!$DB->set_field('question', 'hidden', 0, array('id', $unhide))) {
print_error('cannotunhidequestion', 'question');
}
redirect($pageurl->out());
}
}
/**
* Shows the question bank editing interface.
*
* The function also processes a number of actions:
*
* Actions affecting the question pool:
* move Moves a question to a different category
* deleteselected Deletes the selected questions from the category
* Other actions:
* category Chooses the category
* displayoptions Sets display options
*
* @author Martin Dougiamas and many others. This has recently been extensively
* rewritten by Gustav Delius and other members of the Serving Mathematics project
* {@link http://maths.york.ac.uk/serving_maths}
* @param moodle_url $pageurl object representing this pages url.
*/
function question_showbank($tabname, $contexts, $pageurl, $cm, $page, $perpage, $sortorder, $sortorderdecoded, $cat, $recurse, $showhidden, $showquestiontext){
global $COURSE, $DB;
if (optional_param('deleteselected', false, PARAM_BOOL)){ // teacher still has to confirm
// make a list of all the questions that are selected
$rawquestions = $_REQUEST; // This code is called by both POST forms and GET links, so cannot use data_submitted.
$questionlist = ''; // comma separated list of ids of questions to be deleted
$questionnames = ''; // string with names of questions separated by <br /> with
// an asterix in front of those that are in use
$inuse = false; // set to true if at least one of the questions is in use
foreach ($rawquestions as $key => $value) { // Parse input for question ids
if (preg_match('!^q([0-9]+)$!', $key, $matches)) {
$key = $matches[1];
$questionlist .= $key.',';
question_require_capability_on($key, 'edit');
if ($DB->record_exists('quiz_question_instances', array('question' => $key))) {
$questionnames .= '* ';
$inuse = true;
}
$questionnames .= $DB->get_field('question', 'name', array('id' => $key)).'<br />';
}
}
if (!$questionlist) { // no questions were selected
redirect($pageurl->out());
}
$questionlist = rtrim($questionlist, ',');
// Add an explanation about questions in use
if ($inuse) {
$questionnames .= '<br />'.get_string('questionsinuse', 'quiz');
}
notice_yesno(get_string("deletequestionscheck", "quiz", $questionnames),
$pageurl->out_action(array('deleteselected'=>$questionlist, 'confirm'=>md5($questionlist))),
$pageurl->out_action());
echo '</td></tr>';
echo '</table>';
print_footer($COURSE);
exit;
}
// starts with category selection form
print_box_start('generalbox questionbank');
print_heading(get_string('questionbank', 'question'), '', 2);
question_category_form($contexts->having_one_edit_tab_cap($tabname), $pageurl, $cat, $recurse, $showhidden, $showquestiontext);
// continues with list of questions
question_list($contexts->having_one_edit_tab_cap($tabname), $pageurl, $cat, isset($cm) ? $cm : null,
$recurse, $page, $perpage, $showhidden, $sortorder, $sortorderdecoded, $showquestiontext,
$contexts->having_cap('moodle/question:add'));
print_box_end();
}
/**
* Common setup for all pages for editing questions.
* @param string $edittab code for this edit tab
* @param boolean $requirecmid require cmid? default false
* @param boolean $requirecourseid require courseid, if cmid is not given? default true
* @return array $thispageurl, $contexts, $cmid, $cm, $module, $pagevars
*/
function question_edit_setup($edittab, $requirecmid = false, $requirecourseid = true){
global $COURSE, $QUESTION_EDITTABCAPS, $DB;
//$thispageurl is used to construct urls for all question edit pages we link to from this page. It contains an array
//of parameters that are passed from page to page.
$thispageurl = new moodle_url();
if ($requirecmid){
$cmid =required_param('cmid', PARAM_INT);
} else {
$cmid = optional_param('cmid', 0, PARAM_INT);
}
if ($cmid){
list($module, $cm) = get_module_from_cmid($cmid);
$courseid = $cm->course;
$thispageurl->params(compact('cmid'));
require_login($courseid, false, $cm);
$thiscontext = get_context_instance(CONTEXT_MODULE, $cmid);
} else {
$module = null;
$cm = null;
if ($requirecourseid){
$courseid = required_param('courseid', PARAM_INT);
} else {
$courseid = optional_param('courseid', 0, PARAM_INT);
}
if ($courseid){
$thispageurl->params(compact('courseid'));
require_login($courseid, false);
$thiscontext = get_context_instance(CONTEXT_COURSE, $courseid);
} else {
$thiscontext = null;
}
}
if ($thiscontext){
$contexts = new question_edit_contexts($thiscontext);
$contexts->require_one_edit_tab_cap($edittab);
} else {
$contexts = null;
}
$pagevars['qpage'] = optional_param('qpage', -1, PARAM_INT);
//pass 'cat' from page to page and when 'category' comes from a drop down menu
//then we also reset the qpage so we go to page 1 of
//a new cat.
$pagevars['cat'] = optional_param('cat', 0, PARAM_SEQUENCE);// if empty will be set up later
if ($category = optional_param('category', 0, PARAM_SEQUENCE)){
if ($pagevars['cat'] != $category){ // is this a move to a new category?
$pagevars['cat'] = $category;
$pagevars['qpage'] = 0;
}
}
if ($pagevars['cat']){
$thispageurl->param('cat', $pagevars['cat']);
}
if ($pagevars['qpage'] > -1) {
$thispageurl->param('qpage', $pagevars['qpage']);
} else {
$pagevars['qpage'] = 0;
}
$pagevars['qperpage'] = optional_param('qperpage', -1, PARAM_INT);
if ($pagevars['qperpage'] > -1) {
$thispageurl->param('qperpage', $pagevars['qperpage']);
} else {
$pagevars['qperpage'] = DEFAULT_QUESTIONS_PER_PAGE;
}
$sortoptions = array('alpha' => 'name, qtype ASC',
'typealpha' => 'qtype, name ASC',
'age' => 'id ASC');
if ($sortorder = optional_param('qsortorder', '', PARAM_ALPHA)) {
$pagevars['qsortorderdecoded'] = $sortoptions[$sortorder];
$pagevars['qsortorder'] = $sortorder;
$thispageurl->param('qsortorder', $sortorder);
} else {
$pagevars['qsortorderdecoded'] = $sortoptions['typealpha'];
$pagevars['qsortorder'] = 'typealpha';
}
$defaultcategory = question_make_default_categories($contexts->all());
$contextlistarr = array();
foreach ($contexts->having_one_edit_tab_cap($edittab) as $context){
$contextlistarr[] = "'$context->id'";
}
$contextlist = join($contextlistarr, ' ,');
if (!empty($pagevars['cat'])){
$catparts = explode(',', $pagevars['cat']);
if (!$catparts[0] || (FALSE !== array_search($catparts[1], $contextlistarr)) ||
!$DB->count_records_select("question_categories", "id = ? AND contextid = ?", array($catparts[0], $catparts[1]))) {
print_error('invalidcategory', 'quiz');
}
} else {
$category = $defaultcategory;
$pagevars['cat'] = "$category->id,$category->contextid";
}
if(($recurse = optional_param('recurse', -1, PARAM_BOOL)) != -1) {
$pagevars['recurse'] = $recurse;
$thispageurl->param('recurse', $recurse);
} else {
$pagevars['recurse'] = 1;
}
if(($showhidden = optional_param('showhidden', -1, PARAM_BOOL)) != -1) {
$pagevars['showhidden'] = $showhidden;
$thispageurl->param('showhidden', $showhidden);
} else {
$pagevars['showhidden'] = 0;
}
if(($showquestiontext = optional_param('showquestiontext', -1, PARAM_BOOL)) != -1) {
$pagevars['showquestiontext'] = $showquestiontext;
$thispageurl->param('showquestiontext', $showquestiontext);
} else {
$pagevars['showquestiontext'] = 0;
}
//category list page
$pagevars['cpage'] = optional_param('cpage', 1, PARAM_INT);
if ($pagevars['cpage'] != 1){
$thispageurl->param('cpage', $pagevars['cpage']);
}
return array($thispageurl, $contexts, $cmid, $cm, $module, $pagevars);
}
class question_edit_contexts{
var $allcontexts;
/**
* @param current context
*/
function question_edit_contexts($thiscontext){
$pcontextids = get_parent_contexts($thiscontext);
$contexts = array($thiscontext);
foreach ($pcontextids as $pcontextid){
$contexts[] = get_context_instance_by_id($pcontextid);
}
$this->allcontexts = $contexts;
}
/**
* @return array all parent contexts
*/
function all(){
return $this->allcontexts;
}
/**
* @return object lowest context which must be either the module or course context
*/
function lowest(){
return $this->allcontexts[0];
}
/**
* @param string $cap capability
* @return array parent contexts having capability, zero based index
*/
function having_cap($cap){
$contextswithcap = array();
foreach ($this->allcontexts as $context){
if (has_capability($cap, $context)){
$contextswithcap[] = $context;
}
}
return $contextswithcap;
}
/**
* @param array $caps capabilities
* @return array parent contexts having at least one of $caps, zero based index
*/
function having_one_cap($caps){
$contextswithacap = array();
foreach ($this->allcontexts as $context){
foreach ($caps as $cap){
if (has_capability($cap, $context)){
$contextswithacap[] = $context;
break; //done with caps loop
}
}
}
return $contextswithacap;
}
/**
* @param string $tabname edit tab name
* @return array parent contexts having at least one of $caps, zero based index
*/
function having_one_edit_tab_cap($tabname){
global $QUESTION_EDITTABCAPS;
return $this->having_one_cap($QUESTION_EDITTABCAPS[$tabname]);
}
/**
* Has at least one parent context got the cap $cap?
*
* @param string $cap capability
* @return boolean
*/
function have_cap($cap){
return (count($this->having_cap($cap)));
}
/**
* Has at least one parent context got one of the caps $caps?
*
* @param string $cap capability
* @return boolean
*/
function have_one_cap($caps){
foreach ($caps as $cap){
if ($this->have_cap($cap)){
return true;
}
}
return false;
}
/**
* Has at least one parent context got one of the caps for actions on $tabname
*
* @param string $tabname edit tab name
* @return boolean
*/
function have_one_edit_tab_cap($tabname){
global $QUESTION_EDITTABCAPS;
return $this->have_one_cap($QUESTION_EDITTABCAPS[$tabname]);
}
/**
* Throw error if at least one parent context hasn't got the cap $cap
*
* @param string $cap capability
*/
function require_cap($cap){
if (!$this->have_cap($cap)){
print_error('nopermissions', '', '', $cap);
}
}
/**
* Throw error if at least one parent context hasn't got one of the caps $caps
*
* @param array $cap capabilities
*/
function require_one_cap($caps){
if (!$this->have_one_cap($caps)){
$capsstring = join($caps, ', ');
print_error('nopermissions', '', '', $capsstring);
}
}
/**
* Throw error if at least one parent context hasn't got one of the caps $caps
*
* @param string $tabname edit tab name
*/
function require_one_edit_tab_cap($tabname){
if (!$this->have_one_edit_tab_cap($tabname)){
print_error('nopermissions', '', '', 'access question edit tab '.$tabname);
}
}
}
//capabilities for each page of edit tab.
//this determines which contexts' categories are available. At least one
//page is displayed if user has one of the capability on at least one context
$QUESTION_EDITTABCAPS = array(
'editq' => array('moodle/question:add',
'moodle/question:editmine',
'moodle/question:editall',
'moodle/question:viewmine',
'moodle/question:viewall',
'moodle/question:usemine',
'moodle/question:useall',
'moodle/question:movemine',
'moodle/question:moveall'),
'questions'=>array('moodle/question:add',
'moodle/question:editmine',
'moodle/question:editall',
'moodle/question:viewmine',
'moodle/question:viewall',
'moodle/question:movemine',
'moodle/question:moveall'),
'categories'=>array('moodle/question:managecategory'),
'import'=>array('moodle/question:add'),
'export'=>array('moodle/question:viewall', 'moodle/question:viewmine'));
/**
* Make sure user is logged in as required in this context.
*/
function require_login_in_context($contextorid = null){
global $DB;
if (!is_object($contextorid)){
$context = get_context_instance_by_id($contextorid);
} else {
$context = $contextorid;
}
if ($context && ($context->contextlevel == CONTEXT_COURSE)) {
require_login($context->instanceid);
} else if ($context && ($context->contextlevel == CONTEXT_MODULE)) {
if ($cm = $DB->get_record('course_modules',array('id' =>$context->instanceid))) {
if (!$course = $DB->get_record('course', array('id' => $cm->course))) {
print_error('invalidcourseid');
}
require_course_login($course, true, $cm);
} else {
print_error('invalidcoursemodule');
}
} else if ($context && ($context->contextlevel == CONTEXT_SYSTEM)) {
if (!empty($CFG->forcelogin)) {
require_login();
}
} else {
require_login();
}
}
?>