/**
* Check and set data to sort return comparation function
* $field field to compare
* $descending order
*/
public static function set_order($field, $ascending = true)
{
$sortfields = array('name' => array('name'), 'shortdescription' => array('shortdescription'), 'startdate' => array('startdate', 'duedate', 'name'), 'duedate' => array('duedate', 'startdate', 'name'), 'automaticgrading' => array('automaticgrading', 'duedate', 'name'));
if (isset($sortfields[$field])) {
self::$fields = $sortfields[$field];
} else {
//Unknow field
self::$fields = $sortfields['duedate'];
}
if ($ascending) {
self::$ascending = -1;
} else {
self::$ascending = 1;
}
}
if ($vpl->get_grade() != 0 && !$instance->example) {
$no_grade = false;
}
if ($instance->startdate > 0) {
$startdate = true;
}
if ($instance->duedate > 0) {
$duedate = true;
}
}
//if no instance with grade
$grader = $grader && !$no_grade;
$student = $student && !$no_grade;
//usort of old PHP versions don't call static class functions
if ($sort > '') {
$corder = new vpl_list_util();
$corder->set_order($sort, $sortdir == 'down');
usort($vpls, array($corder, 'cpm'));
}
//Generate table
$table = new html_table();
$table->attributes['class'] = 'generaltable mod_index';
$table->head = array('#', $strname, $strshortdescription);
$table->align = array('left', 'left', 'left');
if ($startdate) {
$table->head[] = $strstartdate;
$table->align[] = 'center';
}
if ($duedate) {
$table->head[] = $strduedate;
$table->align[] = 'center';
