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<?php
if (!defined('MOODLE_INTERNAL')) {
die('Direct access to this script is forbidden.'); /// It must be included from a Moodle page
}
require_once($CFG->libdir.'/formslib.php');
require_once($CFG->libdir.'/questionlib.php');
class delete_category_form extends moodleform {
var $_category;
function definition() {
global $CFG, $DB;
$mform =& $this->_form;
$category = $this->_customdata;
$categorycontext = context_coursecat::instance($category->id);
$this->_category = $category;
/// Check permissions, to see if it OK to give the option to delete
/// the contents, rather than move elsewhere.
/// Are there any subcategories of this one, can they be deleted?
$candeletecontent = true;
$tocheck = get_child_categories($category->id);
$containscategories = !empty($tocheck);
$categoryids = array($category->id);
while (!empty($tocheck)) {
$checkcat = array_pop($tocheck);
$childcategoryids[] = $checkcat->id;
$tocheck = $tocheck + get_child_categories($checkcat->id);
$chcontext = context_coursecat::instance($checkcat->id);
if ($candeletecontent && !has_capability('moodle/category:manage', $chcontext)) {
$candeletecontent = false;
}
}
/// Are there any courses in here, can they be deleted?
list($test, $params) = $DB->get_in_or_equal($categoryids);
$containedcourses = $DB->get_records_sql(
"SELECT id,1 FROM {course} c WHERE c.category $test", $params);
$containscourses = false;
if ($containedcourses) {
$containscourses = true;
foreach ($containedcourses as $courseid => $notused) {
if ($candeletecontent && !can_delete_course($courseid)) {
$candeletecontent = false;
break;
}
}
}
/// Are there any questions in the question bank here?
$containsquestions = question_context_has_any_questions($categorycontext);
/// Get the list of categories we might be able to move to.
$testcaps = array();
if ($containscourses) {
$testcaps[] = 'moodle/course:create';
}
if ($containscategories || $containsquestions) {
$testcaps[] = 'moodle/category:manage';
}
$displaylist = array();
$notused = array();
if (!empty($testcaps)) {
make_categories_list($displaylist, $notused, $testcaps, $category->id);
}
/// Now build the options.
$options = array();
if ($displaylist) {
$options[0] = get_string('movecontentstoanothercategory');
}
if ($candeletecontent) {
$options[1] = get_string('deleteallcannotundo');
}
/// Now build the form.
$mform->addElement('header','general', get_string('categorycurrentcontents', '', format_string($category->name, true, array('context' => $categorycontext))));
if ($containscourses || $containscategories || $containsquestions) {
if (empty($options)) {
print_error('youcannotdeletecategory', 'error', 'index.php', format_string($category->name, true, array('context' => $categorycontext)));
}
/// Describe the contents of this category.
$contents = '<ul>';
if ($containscategories) {
$contents .= '<li>' . get_string('subcategories') . '</li>';
}
if ($containscourses) {
$contents .= '<li>' . get_string('courses') . '</li>';
}
if ($containsquestions) {
$contents .= '<li>' . get_string('questionsinthequestionbank') . '</li>';
}
$contents .= '</ul>';
$mform->addElement('static', 'emptymessage', get_string('thiscategorycontains'), $contents);
/// Give the options for what to do.
$mform->addElement('select', 'fulldelete', get_string('whattodo'), $options);
if (count($options) == 1) {
$optionkeys = array_keys($options);
$option = reset($optionkeys);
$mform->hardFreeze('fulldelete');
$mform->setConstant('fulldelete', $option);
}
if ($displaylist) {
$mform->addElement('select', 'newparent', get_string('movecategorycontentto'), $displaylist);
if (in_array($category->parent, $displaylist)) {
$mform->setDefault('newparent', $category->parent);
}
$mform->disabledIf('newparent', 'fulldelete', 'eq', '1');
}
} else {
$mform->addElement('hidden', 'fulldelete', 1);
$mform->setType('fulldelete', PARAM_INT);
$mform->addElement('static', 'emptymessage', '', get_string('deletecategoryempty'));
}
$mform->addElement('hidden', 'delete');
$mform->setType('delete', PARAM_ALPHANUM);
$mform->addElement('hidden', 'sure');
$mform->setType('sure', PARAM_ALPHANUM);
$mform->setDefault('sure', md5(serialize($category)));
//--------------------------------------------------------------------------------
$this->add_action_buttons(true, get_string('delete'));
}
/// perform some extra moodle validation
function validation($data, $files) {
$errors = parent::validation($data, $files);
if (empty($data['fulldelete']) && empty($data['newparent'])) {
/// When they have chosen the move option, they must specify a destination.
$errors['newparent'] = get_string('required');
}
if ($data['sure'] != md5(serialize($this->_category))) {
$errors['categorylabel'] = get_string('categorymodifiedcancel');
}
return $errors;
}
}
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