* @copyright 2001-2007 VIKO team and contributors * @license http://www.gnu.org/licenses/gpl.html GPL 2.0 */ require_once 'Module.php'; require_once 'HTML/QuickForm.php'; require_once 'HTML/QuickForm/Renderer/VIKO.php'; require_once 'StudentList.php'; require_once 'HTML.php'; /** * Manages the deleting of courses * *

*
• /course-delete/#id - shows confirmation dialog about deleting course with ID #id
*
• /course-delete/#id/yes-please - actually deletes course with ID #id
*

* * Only the teacher of the course is allowed to remove it. */ class Module_CourseDelete extends Module { /** * Course, that is to be removed * * @var Course */ var $_course_to_delete = null; /** * Has the user sayd "please"? * * @var Course */ var $_yes_please_delete_it = false; /** * Constructs new CourseAdd Module * * @param array $parameters parameters to the module */ function Module_CourseDelete( $parameters ) { // this module needes the ID of the course to be removed if ( isset($parameters[0]) && (int)$parameters[0] > 0 ) { $this->_course_to_delete =& new Course(); $this->_course_to_delete->setID( (int)$parameters[0] ); } else { trigger_error("No course ID specified.", E_USER_ERROR); } // the second parameter is for confirmation if ( isset($parameters[1]) && $parameters[1]=='yes-please' ) { $this->_yes_please_delete_it = true; } } /** * Returns the module identifier string * * @access public * @static * @return string Identificator of module */ function getID() { return "course-delete"; } /** * Returns CourseDelete page in HTML * * @return string HTML fragment */ function toHTML() { // only teachers can delete courses if ( !$_SESSION['user']->hasAccessToGroup("TEACHER") ) { return $this->accessDeniedPage( _("You are not authorized to delete courses.") ); } // the course has to exist -- try loading it from database if ( !$this->_course_to_delete->loadFromDatabaseByID() ) { return $this->errorPage( _("The selected course does not exist.") ); } // only the teacher who owns the course can delete it $course_teacher = $this->_course_to_delete->getTeacher(); if ( $_SESSION['user']->getID() != $course_teacher->getID() ) { return $this->accessDeniedPage( _("You are not authorized to delete this course.") ); } // The user has to say "please" to confirm he truly wants to delete it // If he hasn't sayd that, show him a link he can click to say "please". if ( $this->_yes_please_delete_it ) { // remove the course (The students will probably say "Hurray!" now) $this->_course_to_delete->delete(); // send back to the MyVIKO page $this->redirect("my-viko"); return false; } else { $name = $this->_course_to_delete->getHTMLName(); $title = sprintf( _("Are you really sure you want to delete the course %s?"), HTML::strong( $name ) ); $html = $this->title( $title ); $nr_of_students = StudentList::getCountFromCourse( $this->_course_to_delete ); if ( $nr_of_students > 0 ) { $translated_text = ngettext( "There is %d student on this course.", "There are %d students on this course.", $nr_of_students ); $html.= HTML::p( sprintf( $translated_text, $nr_of_students ) ); } $id = $this->_course_to_delete->getID(); $html.= HTML::p( HTML::a( $this->URI("course-delete", $id, "yes-please"), _("Yes, please remove this course.") ) ); return $html; } } } ?>