* lesson::load($lessonid);
* // or
* $lessonrecord = $DB->get_record('lesson', $lessonid);
* $lesson = new lesson($lessonrecord);
*
*
* The class itself extends lesson_base as all classes within the lesson module should
*
* These properties are from the database
* @property int $id The id of this lesson
* @property int $course The ID of the course this lesson belongs to
* @property string $name The name of this lesson
* @property int $practice Flag to toggle this as a practice lesson
* @property int $modattempts Toggle to allow the user to go back and review answers
* @property int $usepassword Toggle the use of a password for entry
* @property string $password The password to require users to enter
* @property int $dependency ID of another lesson this lesson is dependent on
* @property string $conditions Conditions of the lesson dependency
* @property int $grade The maximum grade a user can achieve (%)
* @property int $custom Toggle custom scoring on or off
* @property int $ongoing Toggle display of an ongoing score
* @property int $usemaxgrade How retakes are handled (max=1, mean=0)
* @property int $maxanswers The max number of answers or branches
* @property int $maxattempts The maximum number of attempts a user can record
* @property int $review Toggle use or wrong answer review button
* @property int $nextpagedefault Override the default next page
* @property int $feedback Toggles display of default feedback
* @property int $minquestions Sets a minimum value of pages seen when calculating grades
* @property int $maxpages Maximum number of pages this lesson can contain
* @property int $retake Flag to allow users to retake a lesson
* @property int $activitylink Relate this lesson to another lesson
* @property string $mediafile File to pop up to or webpage to display
* @property int $mediaheight Sets the height of the media file popup
* @property int $mediawidth Sets the width of the media file popup
* @property int $mediaclose Toggle display of a media close button
* @property int $slideshow Flag for whether branch pages should be shown as slideshows
* @property int $width Width of slideshow
* @property int $height Height of slideshow
* @property string $bgcolor Background colour of slideshow
* @property int $displayleft Display a left menu
* @property int $displayleftif Sets the condition on which the left menu is displayed
* @property int $progressbar Flag to toggle display of a lesson progress bar
* @property int $available Timestamp of when this lesson becomes available
* @property int $deadline Timestamp of when this lesson is no longer available
* @property int $timemodified Timestamp when lesson was last modified
* @property int $allowofflineattempts Whether to allow the lesson to be attempted offline in the mobile app
*
* These properties are calculated
* @property int $firstpageid Id of the first page of this lesson (prevpageid=0)
* @property int $lastpageid Id of the last page of this lesson (nextpageid=0)
*
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class lesson extends lesson_base {
/**
* The id of the first page (where prevpageid = 0) gets set and retrieved by
* {@see get_firstpageid()} by directly calling $lesson->firstpageid;
* @var int
*/
protected $firstpageid = null;
/**
* The id of the last page (where nextpageid = 0) gets set and retrieved by
* {@see get_lastpageid()} by directly calling $lesson->lastpageid;
* @var int
*/
protected $lastpageid = null;
/**
* An array used to cache the pages associated with this lesson after the first
* time they have been loaded.
* A note to developers: If you are going to be working with MORE than one or
* two pages from a lesson you should probably call {@see $lesson->load_all_pages()}
* in order to save excess database queries.
* @var array An array of lesson_page objects
*/
protected $pages = array();
/**
* Flag that gets set to true once all of the pages associated with the lesson
* have been loaded.
* @var bool
*/
protected $loadedallpages = false;
/**
* Course module object gets set and retrieved by directly calling $lesson->cm;
* @see get_cm()
* @var stdClass
*/
protected $cm = null;
/**
* Course object gets set and retrieved by directly calling $lesson->courserecord;
* @see get_courserecord()
* @var stdClass
*/
protected $courserecord = null;
/**
* Context object gets set and retrieved by directly calling $lesson->context;
* @see get_context()
* @var stdClass
*/
protected $context = null;
/**
* Constructor method
*
* @param object $properties
* @param stdClass $cm course module object
* @param stdClass $course course object
* @since Moodle 3.3
*/
public function __construct($properties, $cm = null, $course = null) {
parent::__construct($properties);
$this->cm = $cm;
$this->courserecord = $course;
}
/**
* Simply generates a lesson object given an array/object of properties
* Overrides {@see lesson_base->create()}
* @static
* @param object|array $properties
* @return lesson
*/
public static function create($properties) {
return new lesson($properties);
}
/**
* Generates a lesson object from the database given its id
* @static
* @param int $lessonid
* @return lesson
*/
public static function load($lessonid) {
global $DB;
if (!$lesson = $DB->get_record('lesson', array('id' => $lessonid))) {
print_error('invalidcoursemodule');
}
return new lesson($lesson);
}
/**
* Deletes this lesson from the database
*/
public function delete() {
global $CFG, $DB;
require_once($CFG->libdir.'/gradelib.php');
require_once($CFG->dirroot.'/calendar/lib.php');
$cm = get_coursemodule_from_instance('lesson', $this->properties->id, $this->properties->course);
$context = context_module::instance($cm->id);
$this->delete_all_overrides();
grade_update('mod/lesson', $this->properties->course, 'mod', 'lesson', $this->properties->id, 0, null, array('deleted'=>1));
// We must delete the module record after we delete the grade item.
$DB->delete_records("lesson", array("id"=>$this->properties->id));
$DB->delete_records("lesson_pages", array("lessonid"=>$this->properties->id));
$DB->delete_records("lesson_answers", array("lessonid"=>$this->properties->id));
$DB->delete_records("lesson_attempts", array("lessonid"=>$this->properties->id));
$DB->delete_records("lesson_grades", array("lessonid"=>$this->properties->id));
$DB->delete_records("lesson_timer", array("lessonid"=>$this->properties->id));
$DB->delete_records("lesson_branch", array("lessonid"=>$this->properties->id));
if ($events = $DB->get_records('event', array("modulename"=>'lesson', "instance"=>$this->properties->id))) {
$coursecontext = context_course::instance($cm->course);
foreach($events as $event) {
$event->context = $coursecontext;
$event = calendar_event::load($event);
$event->delete();
}
}
// Delete files associated with this module.
$fs = get_file_storage();
$fs->delete_area_files($context->id);
return true;
}
/**
* Deletes a lesson override from the database and clears any corresponding calendar events
*
* @param int $overrideid The id of the override being deleted
* @return bool true on success
*/
public function delete_override($overrideid) {
global $CFG, $DB;
require_once($CFG->dirroot . '/calendar/lib.php');
$cm = get_coursemodule_from_instance('lesson', $this->properties->id, $this->properties->course);
$override = $DB->get_record('lesson_overrides', array('id' => $overrideid), '*', MUST_EXIST);
// Delete the events.
$conds = array('modulename' => 'lesson',
'instance' => $this->properties->id);
if (isset($override->userid)) {
$conds['userid'] = $override->userid;
} else {
$conds['groupid'] = $override->groupid;
}
$events = $DB->get_records('event', $conds);
foreach ($events as $event) {
$eventold = calendar_event::load($event);
$eventold->delete();
}
$DB->delete_records('lesson_overrides', array('id' => $overrideid));
// Set the common parameters for one of the events we will be triggering.
$params = array(
'objectid' => $override->id,
'context' => context_module::instance($cm->id),
'other' => array(
'lessonid' => $override->lessonid
)
);
// Determine which override deleted event to fire.
if (!empty($override->userid)) {
$params['relateduserid'] = $override->userid;
$event = \mod_lesson\event\user_override_deleted::create($params);
} else {
$params['other']['groupid'] = $override->groupid;
$event = \mod_lesson\event\group_override_deleted::create($params);
}
// Trigger the override deleted event.
$event->add_record_snapshot('lesson_overrides', $override);
$event->trigger();
return true;
}
/**
* Deletes all lesson overrides from the database and clears any corresponding calendar events
*/
public function delete_all_overrides() {
global $DB;
$overrides = $DB->get_records('lesson_overrides', array('lessonid' => $this->properties->id), 'id');
foreach ($overrides as $override) {
$this->delete_override($override->id);
}
}
/**
* Checks user enrollment in the current course.
*
* @param int $userid
* @return null|stdClass user record
*/
public function is_participant($userid) {
return is_enrolled($this->get_context(), $userid, 'mod/lesson:view', $this->show_only_active_users());
}
/**
* Check is only active users in course should be shown.
*
* @return bool true if only active users should be shown.
*/
public function show_only_active_users() {
return !has_capability('moodle/course:viewsuspendedusers', $this->get_context());
}
/**
* Updates the lesson properties with override information for a user.
*
* Algorithm: For each lesson setting, if there is a matching user-specific override,
* then use that otherwise, if there are group-specific overrides, return the most
* lenient combination of them. If neither applies, leave the quiz setting unchanged.
*
* Special case: if there is more than one password that applies to the user, then
* lesson->extrapasswords will contain an array of strings giving the remaining
* passwords.
*
* @param int $userid The userid.
*/
public function update_effective_access($userid) {
global $DB;
// Check for user override.
$override = $DB->get_record('lesson_overrides', array('lessonid' => $this->properties->id, 'userid' => $userid));
if (!$override) {
$override = new stdClass();
$override->available = null;
$override->deadline = null;
$override->timelimit = null;
$override->review = null;
$override->maxattempts = null;
$override->retake = null;
$override->password = null;
}
// Check for group overrides.
$groupings = groups_get_user_groups($this->properties->course, $userid);
if (!empty($groupings[0])) {
// Select all overrides that apply to the User's groups.
list($extra, $params) = $DB->get_in_or_equal(array_values($groupings[0]));
$sql = "SELECT * FROM {lesson_overrides}
WHERE groupid $extra AND lessonid = ?";
$params[] = $this->properties->id;
$records = $DB->get_records_sql($sql, $params);
// Combine the overrides.
$availables = array();
$deadlines = array();
$timelimits = array();
$reviews = array();
$attempts = array();
$retakes = array();
$passwords = array();
foreach ($records as $gpoverride) {
if (isset($gpoverride->available)) {
$availables[] = $gpoverride->available;
}
if (isset($gpoverride->deadline)) {
$deadlines[] = $gpoverride->deadline;
}
if (isset($gpoverride->timelimit)) {
$timelimits[] = $gpoverride->timelimit;
}
if (isset($gpoverride->review)) {
$reviews[] = $gpoverride->review;
}
if (isset($gpoverride->maxattempts)) {
$attempts[] = $gpoverride->maxattempts;
}
if (isset($gpoverride->retake)) {
$retakes[] = $gpoverride->retake;
}
if (isset($gpoverride->password)) {
$passwords[] = $gpoverride->password;
}
}
// If there is a user override for a setting, ignore the group override.
if (is_null($override->available) && count($availables)) {
$override->available = min($availables);
}
if (is_null($override->deadline) && count($deadlines)) {
if (in_array(0, $deadlines)) {
$override->deadline = 0;
} else {
$override->deadline = max($deadlines);
}
}
if (is_null($override->timelimit) && count($timelimits)) {
if (in_array(0, $timelimits)) {
$override->timelimit = 0;
} else {
$override->timelimit = max($timelimits);
}
}
if (is_null($override->review) && count($reviews)) {
$override->review = max($reviews);
}
if (is_null($override->maxattempts) && count($attempts)) {
$override->maxattempts = max($attempts);
}
if (is_null($override->retake) && count($retakes)) {
$override->retake = max($retakes);
}
if (is_null($override->password) && count($passwords)) {
$override->password = array_shift($passwords);
if (count($passwords)) {
$override->extrapasswords = $passwords;
}
}
}
// Merge with lesson defaults.
$keys = array('available', 'deadline', 'timelimit', 'maxattempts', 'review', 'retake');
foreach ($keys as $key) {
if (isset($override->{$key})) {
$this->properties->{$key} = $override->{$key};
}
}
// Special handling of lesson usepassword and password.
if (isset($override->password)) {
if ($override->password == '') {
$this->properties->usepassword = 0;
} else {
$this->properties->usepassword = 1;
$this->properties->password = $override->password;
if (isset($override->extrapasswords)) {
$this->properties->extrapasswords = $override->extrapasswords;
}
}
}
}
/**
* Fetches messages from the session that may have been set in previous page
* actions.
*
*
* // Do not call this method directly instead use
* $lesson->messages;
*
*
* @return array
*/
protected function get_messages() {
global $SESSION;
$messages = array();
if (!empty($SESSION->lesson_messages) && is_array($SESSION->lesson_messages) && array_key_exists($this->properties->id, $SESSION->lesson_messages)) {
$messages = $SESSION->lesson_messages[$this->properties->id];
unset($SESSION->lesson_messages[$this->properties->id]);
}
return $messages;
}
/**
* Get all of the attempts for the current user.
*
* @param int $retries
* @param bool $correct Optional: only fetch correct attempts
* @param int $pageid Optional: only fetch attempts at the given page
* @param int $userid Optional: defaults to the current user if not set
* @return array|false
*/
public function get_attempts($retries, $correct=false, $pageid=null, $userid=null) {
global $USER, $DB;
$params = array("lessonid"=>$this->properties->id, "userid"=>$userid, "retry"=>$retries);
if ($correct) {
$params['correct'] = 1;
}
if ($pageid !== null) {
$params['pageid'] = $pageid;
}
if ($userid === null) {
$params['userid'] = $USER->id;
}
return $DB->get_records('lesson_attempts', $params, 'timeseen ASC');
}
/**
* Get a list of content pages (formerly known as branch tables) viewed in the lesson for the given user during an attempt.
*
* @param int $lessonattempt the lesson attempt number (also known as retries)
* @param int $userid the user id to retrieve the data from
* @param string $sort an order to sort the results in (a valid SQL ORDER BY parameter)
* @param string $fields a comma separated list of fields to return
* @return array of pages
* @since Moodle 3.3
*/
public function get_content_pages_viewed($lessonattempt, $userid = null, $sort = '', $fields = '*') {
global $USER, $DB;
if ($userid === null) {
$userid = $USER->id;
}
$conditions = array("lessonid" => $this->properties->id, "userid" => $userid, "retry" => $lessonattempt);
return $DB->get_records('lesson_branch', $conditions, $sort, $fields);
}
/**
* Returns the first page for the lesson or false if there isn't one.
*
* This method should be called via the magic method __get();
*
* $firstpage = $lesson->firstpage;
*
*
* @return lesson_page|bool Returns the lesson_page specialised object or false
*/
protected function get_firstpage() {
$pages = $this->load_all_pages();
if (count($pages) > 0) {
foreach ($pages as $page) {
if ((int)$page->prevpageid === 0) {
return $page;
}
}
}
return false;
}
/**
* Returns the last page for the lesson or false if there isn't one.
*
* This method should be called via the magic method __get();
*
* $lastpage = $lesson->lastpage;
*
*
* @return lesson_page|bool Returns the lesson_page specialised object or false
*/
protected function get_lastpage() {
$pages = $this->load_all_pages();
if (count($pages) > 0) {
foreach ($pages as $page) {
if ((int)$page->nextpageid === 0) {
return $page;
}
}
}
return false;
}
/**
* Returns the id of the first page of this lesson. (prevpageid = 0)
* @return int
*/
protected function get_firstpageid() {
global $DB;
if ($this->firstpageid == null) {
if (!$this->loadedallpages) {
$firstpageid = $DB->get_field('lesson_pages', 'id', array('lessonid'=>$this->properties->id, 'prevpageid'=>0));
if (!$firstpageid) {
print_error('cannotfindfirstpage', 'lesson');
}
$this->firstpageid = $firstpageid;
} else {
$firstpage = $this->get_firstpage();
$this->firstpageid = $firstpage->id;
}
}
return $this->firstpageid;
}
/**
* Returns the id of the last page of this lesson. (nextpageid = 0)
* @return int
*/
public function get_lastpageid() {
global $DB;
if ($this->lastpageid == null) {
if (!$this->loadedallpages) {
$lastpageid = $DB->get_field('lesson_pages', 'id', array('lessonid'=>$this->properties->id, 'nextpageid'=>0));
if (!$lastpageid) {
print_error('cannotfindlastpage', 'lesson');
}
$this->lastpageid = $lastpageid;
} else {
$lastpageid = $this->get_lastpage();
$this->lastpageid = $lastpageid->id;
}
}
return $this->lastpageid;
}
/**
* Gets the next page id to display after the one that is provided.
* @param int $nextpageid
* @return bool
*/
public function get_next_page($nextpageid) {
global $USER, $DB;
$allpages = $this->load_all_pages();
if ($this->properties->nextpagedefault) {
// in Flash Card mode...first get number of retakes
$nretakes = $DB->count_records("lesson_grades", array("lessonid" => $this->properties->id, "userid" => $USER->id));
shuffle($allpages);
$found = false;
if ($this->properties->nextpagedefault == LESSON_UNSEENPAGE) {
foreach ($allpages as $nextpage) {
if (!$DB->count_records("lesson_attempts", array("pageid" => $nextpage->id, "userid" => $USER->id, "retry" => $nretakes))) {
$found = true;
break;
}
}
} elseif ($this->properties->nextpagedefault == LESSON_UNANSWEREDPAGE) {
foreach ($allpages as $nextpage) {
if (!$DB->count_records("lesson_attempts", array('pageid' => $nextpage->id, 'userid' => $USER->id, 'correct' => 1, 'retry' => $nretakes))) {
$found = true;
break;
}
}
}
if ($found) {
if ($this->properties->maxpages) {
// check number of pages viewed (in the lesson)
if ($DB->count_records("lesson_attempts", array("lessonid" => $this->properties->id, "userid" => $USER->id, "retry" => $nretakes)) >= $this->properties->maxpages) {
return LESSON_EOL;
}
}
return $nextpage->id;
}
}
// In a normal lesson mode
foreach ($allpages as $nextpage) {
if ((int)$nextpage->id === (int)$nextpageid) {
return $nextpage->id;
}
}
return LESSON_EOL;
}
/**
* Sets a message against the session for this lesson that will displayed next
* time the lesson processes messages
*
* @param string $message
* @param string $class
* @param string $align
* @return bool
*/
public function add_message($message, $class="notifyproblem", $align='center') {
global $SESSION;
if (empty($SESSION->lesson_messages) || !is_array($SESSION->lesson_messages)) {
$SESSION->lesson_messages = array();
$SESSION->lesson_messages[$this->properties->id] = array();
} else if (!array_key_exists($this->properties->id, $SESSION->lesson_messages)) {
$SESSION->lesson_messages[$this->properties->id] = array();
}
$SESSION->lesson_messages[$this->properties->id][] = array($message, $class, $align);
return true;
}
/**
* Check if the lesson is accessible at the present time
* @return bool True if the lesson is accessible, false otherwise
*/
public function is_accessible() {
$available = $this->properties->available;
$deadline = $this->properties->deadline;
return (($available == 0 || time() >= $available) && ($deadline == 0 || time() < $deadline));
}
/**
* Starts the lesson time for the current user
* @return bool Returns true
*/
public function start_timer() {
global $USER, $DB;
$cm = get_coursemodule_from_instance('lesson', $this->properties()->id, $this->properties()->course,
false, MUST_EXIST);
// Trigger lesson started event.
$event = \mod_lesson\event\lesson_started::create(array(
'objectid' => $this->properties()->id,
'context' => context_module::instance($cm->id),
'courseid' => $this->properties()->course
));
$event->trigger();
$USER->startlesson[$this->properties->id] = true;
$timenow = time();
$startlesson = new stdClass;
$startlesson->lessonid = $this->properties->id;
$startlesson->userid = $USER->id;
$startlesson->starttime = $timenow;
$startlesson->lessontime = $timenow;
if (WS_SERVER) {
$startlesson->timemodifiedoffline = $timenow;
}
$DB->insert_record('lesson_timer', $startlesson);
if ($this->properties->timelimit) {
$this->add_message(get_string('timelimitwarning', 'lesson', format_time($this->properties->timelimit)), 'center');
}
return true;
}
/**
* Updates the timer to the current time and returns the new timer object
* @param bool $restart If set to true the timer is restarted
* @param bool $continue If set to true AND $restart=true then the timer
* will continue from a previous attempt
* @return stdClass The new timer
*/
public function update_timer($restart=false, $continue=false, $endreached =false) {
global $USER, $DB;
$cm = get_coursemodule_from_instance('lesson', $this->properties->id, $this->properties->course);
// clock code
// get time information for this user
if (!$timer = $this->get_user_timers($USER->id, 'starttime DESC', '*', 0, 1)) {
$this->start_timer();
$timer = $this->get_user_timers($USER->id, 'starttime DESC', '*', 0, 1);
}
$timer = current($timer); // This will get the latest start time record.
if ($restart) {
if ($continue) {
// continue a previous test, need to update the clock (think this option is disabled atm)
$timer->starttime = time() - ($timer->lessontime - $timer->starttime);
// Trigger lesson resumed event.
$event = \mod_lesson\event\lesson_resumed::create(array(
'objectid' => $this->properties->id,
'context' => context_module::instance($cm->id),
'courseid' => $this->properties->course
));
$event->trigger();
} else {
// starting over, so reset the clock
$timer->starttime = time();
// Trigger lesson restarted event.
$event = \mod_lesson\event\lesson_restarted::create(array(
'objectid' => $this->properties->id,
'context' => context_module::instance($cm->id),
'courseid' => $this->properties->course
));
$event->trigger();
}
}
$timenow = time();
$timer->lessontime = $timenow;
if (WS_SERVER) {
$timer->timemodifiedoffline = $timenow;
}
$timer->completed = $endreached;
$DB->update_record('lesson_timer', $timer);
// Update completion state.
$cm = get_coursemodule_from_instance('lesson', $this->properties()->id, $this->properties()->course,
false, MUST_EXIST);
$course = get_course($cm->course);
$completion = new completion_info($course);
if ($completion->is_enabled($cm) && $this->properties()->completiontimespent > 0) {
$completion->update_state($cm, COMPLETION_COMPLETE);
}
return $timer;
}
/**
* Updates the timer to the current time then stops it by unsetting the user var
* @return bool Returns true
*/
public function stop_timer() {
global $USER, $DB;
unset($USER->startlesson[$this->properties->id]);
$cm = get_coursemodule_from_instance('lesson', $this->properties()->id, $this->properties()->course,
false, MUST_EXIST);
// Trigger lesson ended event.
$event = \mod_lesson\event\lesson_ended::create(array(
'objectid' => $this->properties()->id,
'context' => context_module::instance($cm->id),
'courseid' => $this->properties()->course
));
$event->trigger();
return $this->update_timer(false, false, true);
}
/**
* Checks to see if the lesson has pages
*/
public function has_pages() {
global $DB;
$pagecount = $DB->count_records('lesson_pages', array('lessonid'=>$this->properties->id));
return ($pagecount>0);
}
/**
* Returns the link for the related activity
* @return string
*/
public function link_for_activitylink() {
global $DB;
$module = $DB->get_record('course_modules', array('id' => $this->properties->activitylink));
if ($module) {
$modname = $DB->get_field('modules', 'name', array('id' => $module->module));
if ($modname) {
$instancename = $DB->get_field($modname, 'name', array('id' => $module->instance));
if ($instancename) {
return html_writer::link(new moodle_url('/mod/'.$modname.'/view.php',
array('id' => $this->properties->activitylink)), get_string('activitylinkname',
'lesson', $instancename), array('class' => 'centerpadded lessonbutton standardbutton p-r-1'));
}
}
}
return '';
}
/**
* Loads the requested page.
*
* This function will return the requested page id as either a specialised
* lesson_page object OR as a generic lesson_page.
* If the page has been loaded previously it will be returned from the pages
* array, otherwise it will be loaded from the database first
*
* @param int $pageid
* @return lesson_page A lesson_page object or an object that extends it
*/
public function load_page($pageid) {
if (!array_key_exists($pageid, $this->pages)) {
$manager = lesson_page_type_manager::get($this);
$this->pages[$pageid] = $manager->load_page($pageid, $this);
}
return $this->pages[$pageid];
}
/**
* Loads ALL of the pages for this lesson
*
* @return array An array containing all pages from this lesson
*/
public function load_all_pages() {
if (!$this->loadedallpages) {
$manager = lesson_page_type_manager::get($this);
$this->pages = $manager->load_all_pages($this);
$this->loadedallpages = true;
}
return $this->pages;
}
/**
* Duplicate the lesson page.
*
* @param int $pageid Page ID of the page to duplicate.
* @return void.
*/
public function duplicate_page($pageid) {
global $PAGE;
$cm = get_coursemodule_from_instance('lesson', $this->properties->id, $this->properties->course);
$context = context_module::instance($cm->id);
// Load the page.
$page = $this->load_page($pageid);
$properties = $page->properties();
// The create method checks to see if these properties are set and if not sets them to zero, hence the unsetting here.
if (!$properties->qoption) {
unset($properties->qoption);
}
if (!$properties->layout) {
unset($properties->layout);
}
if (!$properties->display) {
unset($properties->display);
}
$properties->pageid = $pageid;
// Add text and format into the format required to create a new page.
$properties->contents_editor = array(
'text' => $properties->contents,
'format' => $properties->contentsformat
);
$answers = $page->get_answers();
// Answers need to be added to $properties.
$i = 0;
$answerids = array();
foreach ($answers as $answer) {
// Needs to be rearranged to work with the create function.
$properties->answer_editor[$i] = array(
'text' => $answer->answer,
'format' => $answer->answerformat
);
$properties->response_editor[$i] = array(
'text' => $answer->response,
'format' => $answer->responseformat
);
$answerids[] = $answer->id;
$properties->jumpto[$i] = $answer->jumpto;
$properties->score[$i] = $answer->score;
$i++;
}
// Create the duplicate page.
$newlessonpage = lesson_page::create($properties, $this, $context, $PAGE->course->maxbytes);
$newanswers = $newlessonpage->get_answers();
// Copy over the file areas as well.
$this->copy_page_files('page_contents', $pageid, $newlessonpage->id, $context->id);
$j = 0;
foreach ($newanswers as $answer) {
if (isset($answer->answer) && strpos($answer->answer, '@@PLUGINFILE@@') !== false) {
$this->copy_page_files('page_answers', $answerids[$j], $answer->id, $context->id);
}
if (isset($answer->response) && !is_array($answer->response) && strpos($answer->response, '@@PLUGINFILE@@') !== false) {
$this->copy_page_files('page_responses', $answerids[$j], $answer->id, $context->id);
}
$j++;
}
}
/**
* Copy the files from one page to another.
*
* @param string $filearea Area that the files are stored.
* @param int $itemid Item ID.
* @param int $newitemid The item ID for the new page.
* @param int $contextid Context ID for this page.
* @return void.
*/
protected function copy_page_files($filearea, $itemid, $newitemid, $contextid) {
$fs = get_file_storage();
$files = $fs->get_area_files($contextid, 'mod_lesson', $filearea, $itemid);
foreach ($files as $file) {
$fieldupdates = array('itemid' => $newitemid);
$fs->create_file_from_storedfile($fieldupdates, $file);
}
}
/**
* Determines if a jumpto value is correct or not.
*
* returns true if jumpto page is (logically) after the pageid page or
* if the jumpto value is a special value. Returns false in all other cases.
*
* @param int $pageid Id of the page from which you are jumping from.
* @param int $jumpto The jumpto number.
* @return boolean True or false after a series of tests.
**/
public function jumpto_is_correct($pageid, $jumpto) {
global $DB;
// first test the special values
if (!$jumpto) {
// same page
return false;
} elseif ($jumpto == LESSON_NEXTPAGE) {
return true;
} elseif ($jumpto == LESSON_UNSEENBRANCHPAGE) {
return true;
} elseif ($jumpto == LESSON_RANDOMPAGE) {
return true;
} elseif ($jumpto == LESSON_CLUSTERJUMP) {
return true;
} elseif ($jumpto == LESSON_EOL) {
return true;
}
$pages = $this->load_all_pages();
$apageid = $pages[$pageid]->nextpageid;
while ($apageid != 0) {
if ($jumpto == $apageid) {
return true;
}
$apageid = $pages[$apageid]->nextpageid;
}
return false;
}
/**
* Returns the time a user has remaining on this lesson
* @param int $starttime Starttime timestamp
* @return string
*/
public function time_remaining($starttime) {
$timeleft = $starttime + $this->properties->timelimit - time();
$hours = floor($timeleft/3600);
$timeleft = $timeleft - ($hours * 3600);
$minutes = floor($timeleft/60);
$secs = $timeleft - ($minutes * 60);
if ($minutes < 10) {
$minutes = "0$minutes";
}
if ($secs < 10) {
$secs = "0$secs";
}
$output = array();
$output[] = $hours;
$output[] = $minutes;
$output[] = $secs;
$output = implode(':', $output);
return $output;
}
/**
* Interprets LESSON_CLUSTERJUMP jumpto value.
*
* This will select a page randomly
* and the page selected will be inbetween a cluster page and end of clutter or end of lesson
* and the page selected will be a page that has not been viewed already
* and if any pages are within a branch table or end of branch then only 1 page within
* the branch table or end of branch will be randomly selected (sub clustering).
*
* @param int $pageid Id of the current page from which we are jumping from.
* @param int $userid Id of the user.
* @return int The id of the next page.
**/
public function cluster_jump($pageid, $userid=null) {
global $DB, $USER;
if ($userid===null) {
$userid = $USER->id;
}
// get the number of retakes
if (!$retakes = $DB->count_records("lesson_grades", array("lessonid"=>$this->properties->id, "userid"=>$userid))) {
$retakes = 0;
}
// get all the lesson_attempts aka what the user has seen
$seenpages = array();
if ($attempts = $this->get_attempts($retakes)) {
foreach ($attempts as $attempt) {
$seenpages[$attempt->pageid] = $attempt->pageid;
}
}
// get the lesson pages
$lessonpages = $this->load_all_pages();
// find the start of the cluster
while ($pageid != 0) { // this condition should not be satisfied... should be a cluster page
if ($lessonpages[$pageid]->qtype == LESSON_PAGE_CLUSTER) {
break;
}
$pageid = $lessonpages[$pageid]->prevpageid;
}
$clusterpages = array();
$clusterpages = $this->get_sub_pages_of($pageid, array(LESSON_PAGE_ENDOFCLUSTER));
$unseen = array();
foreach ($clusterpages as $key=>$cluster) {
// Remove the page if it is in a branch table or is an endofbranch.
if ($this->is_sub_page_of_type($cluster->id,
array(LESSON_PAGE_BRANCHTABLE), array(LESSON_PAGE_ENDOFBRANCH, LESSON_PAGE_CLUSTER))
|| $cluster->qtype == LESSON_PAGE_ENDOFBRANCH) {
unset($clusterpages[$key]);
} else if ($cluster->qtype == LESSON_PAGE_BRANCHTABLE) {
// If branchtable, check to see if any pages inside have been viewed.
$branchpages = $this->get_sub_pages_of($cluster->id, array(LESSON_PAGE_BRANCHTABLE, LESSON_PAGE_ENDOFBRANCH));
$flag = true;
foreach ($branchpages as $branchpage) {
if (array_key_exists($branchpage->id, $seenpages)) { // Check if any of the pages have been viewed.
$flag = false;
}
}
if ($flag && count($branchpages) > 0) {
// Add branch table.
$unseen[] = $cluster;
}
} elseif ($cluster->is_unseen($seenpages)) {
$unseen[] = $cluster;
}
}
if (count($unseen) > 0) {
// it does not contain elements, then use exitjump, otherwise find out next page/branch
$nextpage = $unseen[rand(0, count($unseen)-1)];
if ($nextpage->qtype == LESSON_PAGE_BRANCHTABLE) {
// if branch table, then pick a random page inside of it
$branchpages = $this->get_sub_pages_of($nextpage->id, array(LESSON_PAGE_BRANCHTABLE, LESSON_PAGE_ENDOFBRANCH));
return $branchpages[rand(0, count($branchpages)-1)]->id;
} else { // otherwise, return the page's id
return $nextpage->id;
}
} else {
// seen all there is to see, leave the cluster
if (end($clusterpages)->nextpageid == 0) {
return LESSON_EOL;
} else {
$clusterendid = $pageid;
while ($clusterendid != 0) { // This condition should not be satisfied... should be an end of cluster page.
if ($lessonpages[$clusterendid]->qtype == LESSON_PAGE_ENDOFCLUSTER) {
break;
}
$clusterendid = $lessonpages[$clusterendid]->nextpageid;
}
$exitjump = $DB->get_field("lesson_answers", "jumpto", array("pageid" => $clusterendid, "lessonid" => $this->properties->id));
if ($exitjump == LESSON_NEXTPAGE) {
$exitjump = $lessonpages[$clusterendid]->nextpageid;
}
if ($exitjump == 0) {
return LESSON_EOL;
} else if (in_array($exitjump, array(LESSON_EOL, LESSON_PREVIOUSPAGE))) {
return $exitjump;
} else {
if (!array_key_exists($exitjump, $lessonpages)) {
$found = false;
foreach ($lessonpages as $page) {
if ($page->id === $clusterendid) {
$found = true;
} else if ($page->qtype == LESSON_PAGE_ENDOFCLUSTER) {
$exitjump = $DB->get_field("lesson_answers", "jumpto", array("pageid" => $page->id, "lessonid" => $this->properties->id));
if ($exitjump == LESSON_NEXTPAGE) {
$exitjump = $lessonpages[$page->id]->nextpageid;
}
break;
}
}
}
if (!array_key_exists($exitjump, $lessonpages)) {
return LESSON_EOL;
}
// Check to see that the return type is not a cluster.
if ($lessonpages[$exitjump]->qtype == LESSON_PAGE_CLUSTER) {
// If the exitjump is a cluster then go through this function again and try to find an unseen question.
$exitjump = $this->cluster_jump($exitjump, $userid);
}
return $exitjump;
}
}
}
}
/**
* Finds all pages that appear to be a subtype of the provided pageid until
* an end point specified within $ends is encountered or no more pages exist
*
* @param int $pageid
* @param array $ends An array of LESSON_PAGE_* types that signify an end of
* the subtype
* @return array An array of specialised lesson_page objects
*/
public function get_sub_pages_of($pageid, array $ends) {
$lessonpages = $this->load_all_pages();
$pageid = $lessonpages[$pageid]->nextpageid; // move to the first page after the branch table
$pages = array();
while (true) {
if ($pageid == 0 || in_array($lessonpages[$pageid]->qtype, $ends)) {
break;
}
$pages[] = $lessonpages[$pageid];
$pageid = $lessonpages[$pageid]->nextpageid;
}
return $pages;
}
/**
* Checks to see if the specified page[id] is a subpage of a type specified in
* the $types array, until either there are no more pages of we find a type
* corresponding to that of a type specified in $ends
*
* @param int $pageid The id of the page to check
* @param array $types An array of types that would signify this page was a subpage
* @param array $ends An array of types that mean this is not a subpage
* @return bool
*/
public function is_sub_page_of_type($pageid, array $types, array $ends) {
$pages = $this->load_all_pages();
$pageid = $pages[$pageid]->prevpageid; // move up one
array_unshift($ends, 0);
// go up the pages till branch table
while (true) {
if ($pageid==0 || in_array($pages[$pageid]->qtype, $ends)) {
return false;
} else if (in_array($pages[$pageid]->qtype, $types)) {
return true;
}
$pageid = $pages[$pageid]->prevpageid;
}
}
/**
* Move a page resorting all other pages.
*
* @param int $pageid
* @param int $after
* @return void
*/
public function resort_pages($pageid, $after) {
global $CFG;
$cm = get_coursemodule_from_instance('lesson', $this->properties->id, $this->properties->course);
$context = context_module::instance($cm->id);
$pages = $this->load_all_pages();
if (!array_key_exists($pageid, $pages) || ($after!=0 && !array_key_exists($after, $pages))) {
print_error('cannotfindpages', 'lesson', "$CFG->wwwroot/mod/lesson/edit.php?id=$cm->id");
}
$pagetomove = clone($pages[$pageid]);
unset($pages[$pageid]);
$pageids = array();
if ($after === 0) {
$pageids['p0'] = $pageid;
}
foreach ($pages as $page) {
$pageids[] = $page->id;
if ($page->id == $after) {
$pageids[] = $pageid;
}
}
$pageidsref = $pageids;
reset($pageidsref);
$prev = 0;
$next = next($pageidsref);
foreach ($pageids as $pid) {
if ($pid === $pageid) {
$page = $pagetomove;
} else {
$page = $pages[$pid];
}
if ($page->prevpageid != $prev || $page->nextpageid != $next) {
$page->move($next, $prev);
if ($pid === $pageid) {
// We will trigger an event.
$pageupdated = array('next' => $next, 'prev' => $prev);
}
}
$prev = $page->id;
$next = next($pageidsref);
if (!$next) {
$next = 0;
}
}
// Trigger an event: page moved.
if (!empty($pageupdated)) {
$eventparams = array(
'context' => $context,
'objectid' => $pageid,
'other' => array(
'pagetype' => $page->get_typestring(),
'prevpageid' => $pageupdated['prev'],
'nextpageid' => $pageupdated['next']
)
);
$event = \mod_lesson\event\page_moved::create($eventparams);
$event->trigger();
}
}
/**
* Return the lesson context object.
*
* @return stdClass context
* @since Moodle 3.3
*/
public function get_context() {
if ($this->context == null) {
$this->context = context_module::instance($this->get_cm()->id);
}
return $this->context;
}
/**
* Set the lesson course module object.
*
* @param stdClass $cm course module objct
* @since Moodle 3.3
*/
private function set_cm($cm) {
$this->cm = $cm;
}
/**
* Return the lesson course module object.
*
* @return stdClass course module
* @since Moodle 3.3
*/
public function get_cm() {
if ($this->cm == null) {
$this->cm = get_coursemodule_from_instance('lesson', $this->properties->id);
}
return $this->cm;
}
/**
* Set the lesson course object.
*
* @param stdClass $course course objct
* @since Moodle 3.3
*/
private function set_courserecord($course) {
$this->courserecord = $course;
}
/**
* Return the lesson course object.
*
* @return stdClass course
* @since Moodle 3.3
*/
public function get_courserecord() {
global $DB;
if ($this->courserecord == null) {
$this->courserecord = $DB->get_record('course', array('id' => $this->properties->course));
}
return $this->courserecord;
}
/**
* Check if the user can manage the lesson activity.
*
* @return bool true if the user can manage the lesson
* @since Moodle 3.3
*/
public function can_manage() {
return has_capability('mod/lesson:manage', $this->get_context());
}
/**
* Check if time restriction is applied.
*
* @return mixed false if there aren't restrictions or an object with the restriction information
* @since Moodle 3.3
*/
public function get_time_restriction_status() {
if ($this->can_manage()) {
return false;
}
if (!$this->is_accessible()) {
if ($this->properties->deadline != 0 && time() > $this->properties->deadline) {
$status = ['reason' => 'lessonclosed', 'time' => $this->properties->deadline];
} else {
$status = ['reason' => 'lessonopen', 'time' => $this->properties->available];
}
return (object) $status;
}
return false;
}
/**
* Check if password restriction is applied.
*
* @param string $userpassword the user password to check (if the restriction is set)
* @return mixed false if there aren't restrictions or an object with the restriction information
* @since Moodle 3.3
*/
public function get_password_restriction_status($userpassword) {
global $USER;
if ($this->can_manage()) {
return false;
}
if ($this->properties->usepassword && empty($USER->lessonloggedin[$this->id])) {
$correctpass = false;
if (!empty($userpassword) &&
(($this->properties->password == md5(trim($userpassword))) || ($this->properties->password == trim($userpassword)))) {
// With or without md5 for backward compatibility (MDL-11090).
$correctpass = true;
$USER->lessonloggedin[$this->id] = true;
} else if (isset($this->properties->extrapasswords)) {
// Group overrides may have additional passwords.
foreach ($this->properties->extrapasswords as $password) {
if (strcmp($password, md5(trim($userpassword))) === 0 || strcmp($password, trim($userpassword)) === 0) {
$correctpass = true;
$USER->lessonloggedin[$this->id] = true;
}
}
}
return !$correctpass;
}
return false;
}
/**
* Check if dependencies restrictions are applied.
*
* @return mixed false if there aren't restrictions or an object with the restriction information
* @since Moodle 3.3
*/
public function get_dependencies_restriction_status() {
global $DB, $USER;
if ($this->can_manage()) {
return false;
}
if ($dependentlesson = $DB->get_record('lesson', array('id' => $this->properties->dependency))) {
// Lesson exists, so we can proceed.
$conditions = unserialize($this->properties->conditions);
// Assume false for all.
$errors = array();
// Check for the timespent condition.
if ($conditions->timespent) {
$timespent = false;
if ($attempttimes = $DB->get_records('lesson_timer', array("userid" => $USER->id, "lessonid" => $dependentlesson->id))) {
// Go through all the times and test to see if any of them satisfy the condition.
foreach ($attempttimes as $attempttime) {
$duration = $attempttime->lessontime - $attempttime->starttime;
if ($conditions->timespent < $duration / 60) {
$timespent = true;
}
}
}
if (!$timespent) {
$errors[] = get_string('timespenterror', 'lesson', $conditions->timespent);
}
}
// Check for the gradebetterthan condition.
if ($conditions->gradebetterthan) {
$gradebetterthan = false;
if ($studentgrades = $DB->get_records('lesson_grades', array("userid" => $USER->id, "lessonid" => $dependentlesson->id))) {
// Go through all the grades and test to see if any of them satisfy the condition.
foreach ($studentgrades as $studentgrade) {
if ($studentgrade->grade >= $conditions->gradebetterthan) {
$gradebetterthan = true;
}
}
}
if (!$gradebetterthan) {
$errors[] = get_string('gradebetterthanerror', 'lesson', $conditions->gradebetterthan);
}
}
// Check for the completed condition.
if ($conditions->completed) {
if (!$DB->count_records('lesson_grades', array('userid' => $USER->id, 'lessonid' => $dependentlesson->id))) {
$errors[] = get_string('completederror', 'lesson');
}
}
if (!empty($errors)) {
return (object) ['errors' => $errors, 'dependentlesson' => $dependentlesson];
}
}
return false;
}
/**
* Check if the lesson is in review mode. (The user already finished it and retakes are not allowed).
*
* @return bool true if is in review mode
* @since Moodle 3.3
*/
public function is_in_review_mode() {
global $DB, $USER;
$userhasgrade = $DB->count_records("lesson_grades", array("lessonid" => $this->properties->id, "userid" => $USER->id));
if ($userhasgrade && !$this->properties->retake) {
return true;
}
return false;
}
/**
* Return the last page the current user saw.
*
* @param int $retriescount the number of retries for the lesson (the last retry number).
* @return mixed false if the user didn't see the lesson or the last page id
*/
public function get_last_page_seen($retriescount) {
global $DB, $USER;
$lastpageseen = false;
$allattempts = $this->get_attempts($retriescount);
if (!empty($allattempts)) {
$attempt = end($allattempts);
$attemptpage = $this->load_page($attempt->pageid);
$jumpto = $DB->get_field('lesson_answers', 'jumpto', array('id' => $attempt->answerid));
// Convert the jumpto to a proper page id.
if ($jumpto == 0) {
// Check if a question has been incorrectly answered AND no more attempts at it are left.
$nattempts = $this->get_attempts($attempt->retry, false, $attempt->pageid, $USER->id);
if (count($nattempts) >= $this->properties->maxattempts) {
$lastpageseen = $this->get_next_page($attemptpage->nextpageid);
} else {
$lastpageseen = $attempt->pageid;
}
} else if ($jumpto == LESSON_NEXTPAGE) {
$lastpageseen = $this->get_next_page($attemptpage->nextpageid);
} else if ($jumpto == LESSON_CLUSTERJUMP) {
$lastpageseen = $this->cluster_jump($attempt->pageid);
} else {
$lastpageseen = $jumpto;
}
}
if ($branchtables = $this->get_content_pages_viewed($retriescount, $USER->id, 'timeseen DESC')) {
// In here, user has viewed a branch table.
$lastbranchtable = current($branchtables);
if (count($allattempts) > 0) {
if ($lastbranchtable->timeseen > $attempt->timeseen) {
// This branch table was viewed more recently than the question page.
if (!empty($lastbranchtable->nextpageid)) {
$lastpageseen = $lastbranchtable->nextpageid;
} else {
// Next page ID did not exist prior to MDL-34006.
$lastpageseen = $lastbranchtable->pageid;
}
}
} else {
// Has not answered any questions but has viewed a branch table.
if (!empty($lastbranchtable->nextpageid)) {
$lastpageseen = $lastbranchtable->nextpageid;
} else {
// Next page ID did not exist prior to MDL-34006.
$lastpageseen = $lastbranchtable->pageid;
}
}
}
return $lastpageseen;
}
/**
* Return the number of retries in a lesson for a given user.
*
* @param int $userid the user id
* @return int the retries count
* @since Moodle 3.3
*/
public function count_user_retries($userid) {
global $DB;
return $DB->count_records('lesson_grades', array("lessonid" => $this->properties->id, "userid" => $userid));
}
/**
* Check if a user left a timed session.
*
* @param int $retriescount the number of retries for the lesson (the last retry number).
* @return true if the user left the timed session
* @since Moodle 3.3
*/
public function left_during_timed_session($retriescount) {
global $DB, $USER;
$conditions = array('lessonid' => $this->properties->id, 'userid' => $USER->id, 'retry' => $retriescount);
return $DB->count_records('lesson_attempts', $conditions) > 0 || $DB->count_records('lesson_branch', $conditions) > 0;
}
/**
* Trigger module viewed event and set the module viewed for completion.
*
* @since Moodle 3.3
*/
public function set_module_viewed() {
global $CFG;
require_once($CFG->libdir . '/completionlib.php');
// Trigger module viewed event.
$event = \mod_lesson\event\course_module_viewed::create(array(
'objectid' => $this->properties->id,
'context' => $this->get_context()
));
$event->add_record_snapshot('course_modules', $this->get_cm());
$event->add_record_snapshot('course', $this->get_courserecord());
$event->trigger();
// Mark as viewed.
$completion = new completion_info($this->get_courserecord());
$completion->set_module_viewed($this->get_cm());
}
/**
* Return the timers in the current lesson for the given user.
*
* @param int $userid the user id
* @param string $sort an order to sort the results in (optional, a valid SQL ORDER BY parameter).
* @param string $fields a comma separated list of fields to return
* @param int $limitfrom return a subset of records, starting at this point (optional).
* @param int $limitnum return a subset comprising this many records in total (optional, required if $limitfrom is set).
* @return array list of timers for the given user in the lesson
* @since Moodle 3.3
*/
public function get_user_timers($userid = null, $sort = '', $fields = '*', $limitfrom = 0, $limitnum = 0) {
global $DB, $USER;
if ($userid === null) {
$userid = $USER->id;
}
$params = array('lessonid' => $this->properties->id, 'userid' => $userid);
return $DB->get_records('lesson_timer', $params, $sort, $fields, $limitfrom, $limitnum);
}
/**
* Check if the user is out of time in a timed lesson.
*
* @param stdClass $timer timer object
* @return bool True if the user is on time, false is the user ran out of time
* @since Moodle 3.3
*/
public function check_time($timer) {
if ($this->properties->timelimit) {
$timeleft = $timer->starttime + $this->properties->timelimit - time();
if ($timeleft <= 0) {
// Out of time.
$this->add_message(get_string('eolstudentoutoftime', 'lesson'));
return false;
} else if ($timeleft < 60) {
// One minute warning.
$this->add_message(get_string('studentoneminwarning', 'lesson'));
}
}
return true;
}
/**
* Add different informative messages to the given page.
*
* @param lesson_page $page page object
* @param reviewmode $bool whether we are in review mode or not
* @since Moodle 3.3
*/
public function add_messages_on_page_view(lesson_page $page, $reviewmode) {
global $DB, $USER;
if (!$this->can_manage()) {
if ($page->qtype == LESSON_PAGE_BRANCHTABLE && $this->properties->minquestions) {
// Tell student how many questions they have seen, how many are required and their grade.
$ntries = $DB->count_records("lesson_grades", array("lessonid" => $this->properties->id, "userid" => $USER->id));
$gradeinfo = lesson_grade($this, $ntries);
if ($gradeinfo->attempts) {
if ($gradeinfo->nquestions < $this->properties->minquestions) {
$a = new stdClass;
$a->nquestions = $gradeinfo->nquestions;
$a->minquestions = $this->properties->minquestions;
$this->add_message(get_string('numberofpagesviewednotice', 'lesson', $a));
}
if (!$reviewmode && $this->properties->ongoing) {
$this->add_message(get_string("numberofcorrectanswers", "lesson", $gradeinfo->earned), 'notify');
if ($this->properties->grade != GRADE_TYPE_NONE) {
$a = new stdClass;
$a->grade = number_format($gradeinfo->grade * $this->properties->grade / 100, 1);
$a->total = $this->properties->grade;
$this->add_message(get_string('yourcurrentgradeisoutof', 'lesson', $a), 'notify');
}
}
}
}
} else {
if ($this->properties->timelimit) {
$this->add_message(get_string('teachertimerwarning', 'lesson'));
}
if (lesson_display_teacher_warning($this)) {
// This is the warning msg for teachers to inform them that cluster
// and unseen does not work while logged in as a teacher.
$warningvars = new stdClass();
$warningvars->cluster = get_string('clusterjump', 'lesson');
$warningvars->unseen = get_string('unseenpageinbranch', 'lesson');
$this->add_message(get_string('teacherjumpwarning', 'lesson', $warningvars));
}
}
}
/**
* Get the ongoing score message for the user (depending on the user permission and lesson settings).
*
* @return str the ongoing score message
* @since Moodle 3.3
*/
public function get_ongoing_score_message() {
global $USER, $DB;
$context = $this->get_context();
if (has_capability('mod/lesson:manage', $context)) {
return get_string('teacherongoingwarning', 'lesson');
} else {
$ntries = $DB->count_records("lesson_grades", array("lessonid" => $this->properties->id, "userid" => $USER->id));
if (isset($USER->modattempts[$this->properties->id])) {
$ntries--;
}
$gradeinfo = lesson_grade($this, $ntries);
$a = new stdClass;
if ($this->properties->custom) {
$a->score = $gradeinfo->earned;
$a->currenthigh = $gradeinfo->total;
return get_string("ongoingcustom", "lesson", $a);
} else {
$a->correct = $gradeinfo->earned;
$a->viewed = $gradeinfo->attempts;
return get_string("ongoingnormal", "lesson", $a);
}
}
}
/**
* Calculate the progress of the current user in the lesson.
*
* @return int the progress (scale 0-100)
* @since Moodle 3.3
*/
public function calculate_progress() {
global $USER, $DB;
// Check if the user is reviewing the attempt.
if (isset($USER->modattempts[$this->properties->id])) {
return 100;
}
// All of the lesson pages.
$pages = $this->load_all_pages();
foreach ($pages as $page) {
if ($page->prevpageid == 0) {
$pageid = $page->id; // Find the first page id.
break;
}
}
// Current attempt number.
if (!$ntries = $DB->count_records("lesson_grades", array("lessonid" => $this->properties->id, "userid" => $USER->id))) {
$ntries = 0; // May not be necessary.
}
$viewedpageids = array();
if ($attempts = $this->get_attempts($ntries, false)) {
foreach ($attempts as $attempt) {
$viewedpageids[$attempt->pageid] = $attempt;
}
}
$viewedbranches = array();
// Collect all of the branch tables viewed.
if ($branches = $this->get_content_pages_viewed($ntries, $USER->id, 'timeseen ASC', 'id, pageid')) {
foreach ($branches as $branch) {
$viewedbranches[$branch->pageid] = $branch;
}
$viewedpageids = array_merge($viewedpageids, $viewedbranches);
}
// Filter out the following pages:
// - End of Cluster
// - End of Branch
// - Pages found inside of Clusters
// Do not filter out Cluster Page(s) because we count a cluster as one.
// By keeping the cluster page, we get our 1.
$validpages = array();
while ($pageid != 0) {
$pageid = $pages[$pageid]->valid_page_and_view($validpages, $viewedpageids);
}
// Progress calculation as a percent.
$progress = round(count($viewedpageids) / count($validpages), 2) * 100;
return (int) $progress;
}
/**
* Calculate the correct page and prepare contents for a given page id (could be a page jump id).
*
* @param int $pageid the given page id
* @param mod_lesson_renderer $lessonoutput the lesson output rendered
* @param bool $reviewmode whether we are in review mode or not
* @param bool $redirect Optional, default to true. Set to false to avoid redirection and return the page to redirect.
* @return array the page object and contents
* @throws moodle_exception
* @since Moodle 3.3
*/
public function prepare_page_and_contents($pageid, $lessonoutput, $reviewmode, $redirect = true) {
global $USER, $CFG;
$page = $this->load_page($pageid);
// Check if the page is of a special type and if so take any nessecary action.
$newpageid = $page->callback_on_view($this->can_manage(), $redirect);
// Avoid redirections returning the jump to special page id.
if (!$redirect && is_numeric($newpageid) && $newpageid < 0) {
return array($newpageid, null, null);
}
if (is_numeric($newpageid)) {
$page = $this->load_page($newpageid);
}
// Add different informative messages to the given page.
$this->add_messages_on_page_view($page, $reviewmode);
if (is_array($page->answers) && count($page->answers) > 0) {
// This is for modattempts option. Find the users previous answer to this page,
// and then display it below in answer processing.
if (isset($USER->modattempts[$this->properties->id])) {
$retries = $this->count_user_retries($USER->id);
if (!$attempts = $this->get_attempts($retries - 1, false, $page->id)) {
throw new moodle_exception('cannotfindpreattempt', 'lesson');
}
$attempt = end($attempts);
$USER->modattempts[$this->properties->id] = $attempt;
} else {
$attempt = false;
}
$lessoncontent = $lessonoutput->display_page($this, $page, $attempt);
} else {
require_once($CFG->dirroot . '/mod/lesson/view_form.php');
$data = new stdClass;
$data->id = $this->get_cm()->id;
$data->pageid = $page->id;
$data->newpageid = $this->get_next_page($page->nextpageid);
$customdata = array(
'title' => $page->title,
'contents' => $page->get_contents()
);
$mform = new lesson_page_without_answers($CFG->wwwroot.'/mod/lesson/continue.php', $customdata);
$mform->set_data($data);
ob_start();
$mform->display();
$lessoncontent = ob_get_contents();
ob_end_clean();
}
return array($page->id, $page, $lessoncontent);
}
/**
* This returns a real page id to jump to (or LESSON_EOL) after processing page responses.
*
* @param lesson_page $page lesson page
* @param int $newpageid the new page id
* @return int the real page to jump to (or end of lesson)
* @since Moodle 3.3
*/
public function calculate_new_page_on_jump(lesson_page $page, $newpageid) {
global $USER, $DB;
$canmanage = $this->can_manage();
if (isset($USER->modattempts[$this->properties->id])) {
// Make sure if the student is reviewing, that he/she sees the same pages/page path that he/she saw the first time.
if ($USER->modattempts[$this->properties->id]->pageid == $page->id && $page->nextpageid == 0) {
// Remember, this session variable holds the pageid of the last page that the user saw.
$newpageid = LESSON_EOL;
} else {
$nretakes = $DB->count_records("lesson_grades", array("lessonid" => $this->properties->id, "userid" => $USER->id));
$nretakes--; // Make sure we are looking at the right try.
$attempts = $DB->get_records("lesson_attempts", array("lessonid" => $this->properties->id, "userid" => $USER->id, "retry" => $nretakes), "timeseen", "id, pageid");
$found = false;
$temppageid = 0;
// Make sure that the newpageid always defaults to something valid.
$newpageid = LESSON_EOL;
foreach ($attempts as $attempt) {
if ($found && $temppageid != $attempt->pageid) {
// Now try to find the next page, make sure next few attempts do no belong to current page.
$newpageid = $attempt->pageid;
break;
}
if ($attempt->pageid == $page->id) {
$found = true; // If found current page.
$temppageid = $attempt->pageid;
}
}
}
} else if ($newpageid != LESSON_CLUSTERJUMP && $page->id != 0 && $newpageid > 0) {
// Going to check to see if the page that the user is going to view next, is a cluster page.
// If so, dont display, go into the cluster.
// The $newpageid > 0 is used to filter out all of the negative code jumps.
$newpage = $this->load_page($newpageid);
if ($overridenewpageid = $newpage->override_next_page($newpageid)) {
$newpageid = $overridenewpageid;
}
} else if ($newpageid == LESSON_UNSEENBRANCHPAGE) {
if ($canmanage) {
if ($page->nextpageid == 0) {
$newpageid = LESSON_EOL;
} else {
$newpageid = $page->nextpageid;
}
} else {
$newpageid = lesson_unseen_question_jump($this, $USER->id, $page->id);
}
} else if ($newpageid == LESSON_PREVIOUSPAGE) {
$newpageid = $page->prevpageid;
} else if ($newpageid == LESSON_RANDOMPAGE) {
$newpageid = lesson_random_question_jump($this, $page->id);
} else if ($newpageid == LESSON_CLUSTERJUMP) {
if ($canmanage) {
if ($page->nextpageid == 0) { // If teacher, go to next page.
$newpageid = LESSON_EOL;
} else {
$newpageid = $page->nextpageid;
}
} else {
$newpageid = $this->cluster_jump($page->id);
}
} else if ($newpageid == 0) {
$newpageid = $page->id;
} else if ($newpageid == LESSON_NEXTPAGE) {
$newpageid = $this->get_next_page($page->nextpageid);
}
return $newpageid;
}
/**
* Process page responses.
*
* @param lesson_page $page page object
* @since Moodle 3.3
*/
public function process_page_responses(lesson_page $page) {
$context = $this->get_context();
// Check the page has answers [MDL-25632].
if (count($page->answers) > 0) {
$result = $page->record_attempt($context);
} else {
// The page has no answers so we will just progress to the next page in the
// sequence (as set by newpageid).
$result = new stdClass;
$result->newpageid = optional_param('newpageid', $page->nextpageid, PARAM_INT);
$result->nodefaultresponse = true;
$result->inmediatejump = false;
}
if ($result->inmediatejump) {
return $result;
}
$result->newpageid = $this->calculate_new_page_on_jump($page, $result->newpageid);
return $result;
}
/**
* Add different informative messages to the given page.
*
* @param lesson_page $page page object
* @param stdClass $result the page processing result object
* @param bool $reviewmode whether we are in review mode or not
* @since Moodle 3.3
*/
public function add_messages_on_page_process(lesson_page $page, $result, $reviewmode) {
if ($this->can_manage()) {
// This is the warning msg for teachers to inform them that cluster and unseen does not work while logged in as a teacher.
if (lesson_display_teacher_warning($this)) {
$warningvars = new stdClass();
$warningvars->cluster = get_string("clusterjump", "lesson");
$warningvars->unseen = get_string("unseenpageinbranch", "lesson");
$this->add_message(get_string("teacherjumpwarning", "lesson", $warningvars));
}
// Inform teacher that s/he will not see the timer.
if ($this->properties->timelimit) {
$this->add_message(get_string("teachertimerwarning", "lesson"));
}
}
// Report attempts remaining.
if ($result->attemptsremaining != 0 && $this->properties->review && !$reviewmode) {
$this->add_message(get_string('attemptsremaining', 'lesson', $result->attemptsremaining));
}
}
/**
* Process and return all the information for the end of lesson page.
*
* @param string $outoftime used to check to see if the student ran out of time
* @return stdclass an object with all the page data ready for rendering
* @since Moodle 3.3
*/
public function process_eol_page($outoftime) {
global $DB, $USER;
$course = $this->get_courserecord();
$cm = $this->get_cm();
$canmanage = $this->can_manage();
// Init all the possible fields and values.
$data = (object) array(
'gradelesson' => true,
'notenoughtimespent' => false,
'numberofpagesviewed' => false,
'youshouldview' => false,
'numberofcorrectanswers' => false,
'displayscorewithessays' => false,
'displayscorewithoutessays' => false,
'yourcurrentgradeisoutof' => false,
'eolstudentoutoftimenoanswers' => false,
'welldone' => false,
'progressbar' => false,
'displayofgrade' => false,
'reviewlesson' => false,
'modattemptsnoteacher' => false,
'activitylink' => false,
'progresscompleted' => false,
);
$ntries = $DB->count_records("lesson_grades", array("lessonid" => $this->properties->id, "userid" => $USER->id));
if (isset($USER->modattempts[$this->properties->id])) {
$ntries--; // Need to look at the old attempts :).
}
$gradeinfo = lesson_grade($this, $ntries);
$data->gradeinfo = $gradeinfo;
if ($this->properties->custom && !$canmanage) {
// Before we calculate the custom score make sure they answered the minimum
// number of questions. We only need to do this for custom scoring as we can
// not get the miniumum score the user should achieve. If we are not using
// custom scoring (so all questions are valued as 1) then we simply check if
// they answered more than the minimum questions, if not, we mark it out of the
// number specified in the minimum questions setting - which is done in lesson_grade().
// Get the number of answers given.
if ($gradeinfo->nquestions < $this->properties->minquestions) {
$data->gradelesson = false;
$a = new stdClass;
$a->nquestions = $gradeinfo->nquestions;
$a->minquestions = $this->properties->minquestions;
$this->add_message(get_string('numberofpagesviewednotice', 'lesson', $a));
}
}
if (!$canmanage) {
if ($data->gradelesson) {
// Store this now before any modifications to pages viewed.
$progresscompleted = $this->calculate_progress();
// Update the clock / get time information for this user.
$this->stop_timer();
// Update completion state.
$completion = new completion_info($course);
if ($completion->is_enabled($cm) && $this->properties->completionendreached) {
$completion->update_state($cm, COMPLETION_COMPLETE);
}
if ($this->properties->completiontimespent > 0) {
$duration = $DB->get_field_sql(
"SELECT SUM(lessontime - starttime)
FROM {lesson_timer}
WHERE lessonid = :lessonid
AND userid = :userid",
array('userid' => $USER->id, 'lessonid' => $this->properties->id));
if (!$duration) {
$duration = 0;
}
// If student has not spend enough time in the lesson, display a message.
if ($duration < $this->properties->completiontimespent) {
$a = new stdClass;
$a->timespentraw = $duration;
$a->timespent = format_time($duration);
$a->timerequiredraw = $this->properties->completiontimespent;
$a->timerequired = format_time($this->properties->completiontimespent);
$data->notenoughtimespent = $a;
}
}
if ($gradeinfo->attempts) {
if (!$this->properties->custom) {
$data->numberofpagesviewed = $gradeinfo->nquestions;
if ($this->properties->minquestions) {
if ($gradeinfo->nquestions < $this->properties->minquestions) {
$data->youshouldview = $this->properties->minquestions;
}
}
$data->numberofcorrectanswers = $gradeinfo->earned;
}
$a = new stdClass;
$a->score = $gradeinfo->earned;
$a->grade = $gradeinfo->total;
if ($gradeinfo->nmanual) {
$a->tempmaxgrade = $gradeinfo->total - $gradeinfo->manualpoints;
$a->essayquestions = $gradeinfo->nmanual;
$data->displayscorewithessays = $a;
} else {
$data->displayscorewithoutessays = $a;
}
if ($this->properties->grade != GRADE_TYPE_NONE) {
$a = new stdClass;
$a->grade = number_format($gradeinfo->grade * $this->properties->grade / 100, 1);
$a->total = $this->properties->grade;
$data->yourcurrentgradeisoutof = $a;
}
$grade = new stdClass();
$grade->lessonid = $this->properties->id;
$grade->userid = $USER->id;
$grade->grade = $gradeinfo->grade;
$grade->completed = time();
if (isset($USER->modattempts[$this->properties->id])) { // If reviewing, make sure update old grade record.
if (!$grades = $DB->get_records("lesson_grades",
array("lessonid" => $this->properties->id, "userid" => $USER->id), "completed DESC", '*', 0, 1)) {
throw new moodle_exception('cannotfindgrade', 'lesson');
}
$oldgrade = array_shift($grades);
$grade->id = $oldgrade->id;
$DB->update_record("lesson_grades", $grade);
} else {
$newgradeid = $DB->insert_record("lesson_grades", $grade);
}
} else {
if ($this->properties->timelimit) {
if ($outoftime == 'normal') {
$grade = new stdClass();
$grade->lessonid = $this->properties->id;
$grade->userid = $USER->id;
$grade->grade = 0;
$grade->completed = time();
$newgradeid = $DB->insert_record("lesson_grades", $grade);
$data->eolstudentoutoftimenoanswers = true;
}
} else {
$data->welldone = true;
}
}
// Update central gradebook.
lesson_update_grades($this, $USER->id);
$data->progresscompleted = $progresscompleted;
}
} else {
// Display for teacher.
if ($this->properties->grade != GRADE_TYPE_NONE) {
$data->displayofgrade = true;
}
}
if ($this->properties->modattempts && !$canmanage) {
// Make sure if the student is reviewing, that he/she sees the same pages/page path that he/she saw the first time
// look at the attempt records to find the first QUESTION page that the user answered, then use that page id
// to pass to view again. This is slick cause it wont call the empty($pageid) code
// $ntries is decremented above.
if (!$attempts = $this->get_attempts($ntries)) {
$attempts = array();
$url = new moodle_url('/mod/lesson/view.php', array('id' => $cm->id));
} else {
$firstattempt = current($attempts);
$pageid = $firstattempt->pageid;
// If the student wishes to review, need to know the last question page that the student answered.
// This will help to make sure that the student can leave the lesson via pushing the continue button.
$lastattempt = end($attempts);
$USER->modattempts[$this->properties->id] = $lastattempt->pageid;
$url = new moodle_url('/mod/lesson/view.php', array('id' => $cm->id, 'pageid' => $pageid));
}
$data->reviewlesson = $url->out(false);
} else if ($this->properties->modattempts && $canmanage) {
$data->modattemptsnoteacher = true;
}
if ($this->properties->activitylink) {
$data->activitylink = $this->link_for_activitylink();
}
return $data;
}
}
/**
* Abstract class to provide a core functions to the all lesson classes
*
* This class should be abstracted by ALL classes with the lesson module to ensure
* that all classes within this module can be interacted with in the same way.
*
* This class provides the user with a basic properties array that can be fetched
* or set via magic methods, or alternatively by defining methods get_blah() or
* set_blah() within the extending object.
*
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class lesson_base {
/**
* An object containing properties
* @var stdClass
*/
protected $properties;
/**
* The constructor
* @param stdClass $properties
*/
public function __construct($properties) {
$this->properties = (object)$properties;
}
/**
* Magic property method
*
* Attempts to call a set_$key method if one exists otherwise falls back
* to simply set the property
*
* @param string $key
* @param mixed $value
*/
public function __set($key, $value) {
if (method_exists($this, 'set_'.$key)) {
$this->{'set_'.$key}($value);
}
$this->properties->{$key} = $value;
}
/**
* Magic get method
*
* Attempts to call a get_$key method to return the property and ralls over
* to return the raw property
*
* @param str $key
* @return mixed
*/
public function __get($key) {
if (method_exists($this, 'get_'.$key)) {
return $this->{'get_'.$key}();
}
return $this->properties->{$key};
}
/**
* Stupid PHP needs an isset magic method if you use the get magic method and
* still want empty calls to work.... blah ~!
*
* @param string $key
* @return bool
*/
public function __isset($key) {
if (method_exists($this, 'get_'.$key)) {
$val = $this->{'get_'.$key}();
return !empty($val);
}
return !empty($this->properties->{$key});
}
//NOTE: E_STRICT does not allow to change function signature!
/**
* If implemented should create a new instance, save it in the DB and return it
*/
//public static function create() {}
/**
* If implemented should load an instance from the DB and return it
*/
//public static function load() {}
/**
* Fetches all of the properties of the object
* @return stdClass
*/
public function properties() {
return $this->properties;
}
}
/**
* Abstract class representation of a page associated with a lesson.
*
* This class should MUST be extended by all specialised page types defined in
* mod/lesson/pagetypes/.
* There are a handful of abstract methods that need to be defined as well as
* severl methods that can optionally be defined in order to make the page type
* operate in the desired way
*
* Database properties
* @property int $id The id of this lesson page
* @property int $lessonid The id of the lesson this page belongs to
* @property int $prevpageid The id of the page before this one
* @property int $nextpageid The id of the next page in the page sequence
* @property int $qtype Identifies the page type of this page
* @property int $qoption Used to record page type specific options
* @property int $layout Used to record page specific layout selections
* @property int $display Used to record page specific display selections
* @property int $timecreated Timestamp for when the page was created
* @property int $timemodified Timestamp for when the page was last modified
* @property string $title The title of this page
* @property string $contents The rich content shown to describe the page
* @property int $contentsformat The format of the contents field
*
* Calculated properties
* @property-read array $answers An array of answers for this page
* @property-read bool $displayinmenublock Toggles display in the left menu block
* @property-read array $jumps An array containing all the jumps this page uses
* @property-read lesson $lesson The lesson this page belongs to
* @property-read int $type The type of the page [question | structure]
* @property-read typeid The unique identifier for the page type
* @property-read typestring The string that describes this page type
*
* @abstract
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class lesson_page extends lesson_base {
/**
* A reference to the lesson this page belongs to
* @var lesson
*/
protected $lesson = null;
/**
* Contains the answers to this lesson_page once loaded
* @var null|array
*/
protected $answers = null;
/**
* This sets the type of the page, can be one of the constants defined below
* @var int
*/
protected $type = 0;
/**
* Constants used to identify the type of the page
*/
const TYPE_QUESTION = 0;
const TYPE_STRUCTURE = 1;
/**
* Constant used as a delimiter when parsing multianswer questions
*/
const MULTIANSWER_DELIMITER = '@^#|';
/**
* This method should return the integer used to identify the page type within
* the database and throughout code. This maps back to the defines used in 1.x
* @abstract
* @return int
*/
abstract protected function get_typeid();
/**
* This method should return the string that describes the pagetype
* @abstract
* @return string
*/
abstract protected function get_typestring();
/**
* This method gets called to display the page to the user taking the lesson
* @abstract
* @param object $renderer
* @param object $attempt
* @return string
*/
abstract public function display($renderer, $attempt);
/**
* Creates a new lesson_page within the database and returns the correct pagetype
* object to use to interact with the new lesson
*
* @final
* @static
* @param object $properties
* @param lesson $lesson
* @return lesson_page Specialised object that extends lesson_page
*/
final public static function create($properties, lesson $lesson, $context, $maxbytes) {
global $DB;
$newpage = new stdClass;
$newpage->title = $properties->title;
$newpage->contents = $properties->contents_editor['text'];
$newpage->contentsformat = $properties->contents_editor['format'];
$newpage->lessonid = $lesson->id;
$newpage->timecreated = time();
$newpage->qtype = $properties->qtype;
$newpage->qoption = (isset($properties->qoption))?1:0;
$newpage->layout = (isset($properties->layout))?1:0;
$newpage->display = (isset($properties->display))?1:0;
$newpage->prevpageid = 0; // this is a first page
$newpage->nextpageid = 0; // this is the only page
if ($properties->pageid) {
$prevpage = $DB->get_record("lesson_pages", array("id" => $properties->pageid), 'id, nextpageid');
if (!$prevpage) {
print_error('cannotfindpages', 'lesson');
}
$newpage->prevpageid = $prevpage->id;
$newpage->nextpageid = $prevpage->nextpageid;
} else {
$nextpage = $DB->get_record('lesson_pages', array('lessonid'=>$lesson->id, 'prevpageid'=>0), 'id');
if ($nextpage) {
// This is the first page, there are existing pages put this at the start
$newpage->nextpageid = $nextpage->id;
}
}
$newpage->id = $DB->insert_record("lesson_pages", $newpage);
$editor = new stdClass;
$editor->id = $newpage->id;
$editor->contents_editor = $properties->contents_editor;
$editor = file_postupdate_standard_editor($editor, 'contents', array('noclean'=>true, 'maxfiles'=>EDITOR_UNLIMITED_FILES, 'maxbytes'=>$maxbytes), $context, 'mod_lesson', 'page_contents', $editor->id);
$DB->update_record("lesson_pages", $editor);
if ($newpage->prevpageid > 0) {
$DB->set_field("lesson_pages", "nextpageid", $newpage->id, array("id" => $newpage->prevpageid));
}
if ($newpage->nextpageid > 0) {
$DB->set_field("lesson_pages", "prevpageid", $newpage->id, array("id" => $newpage->nextpageid));
}
$page = lesson_page::load($newpage, $lesson);
$page->create_answers($properties);
// Trigger an event: page created.
$eventparams = array(
'context' => $context,
'objectid' => $newpage->id,
'other' => array(
'pagetype' => $page->get_typestring()
)
);
$event = \mod_lesson\event\page_created::create($eventparams);
$snapshot = clone($newpage);
$snapshot->timemodified = 0;
$event->add_record_snapshot('lesson_pages', $snapshot);
$event->trigger();
$lesson->add_message(get_string('insertedpage', 'lesson').': '.format_string($newpage->title, true), 'notifysuccess');
return $page;
}
/**
* This method loads a page object from the database and returns it as a
* specialised object that extends lesson_page
*
* @final
* @static
* @param int $id
* @param lesson $lesson
* @return lesson_page Specialised lesson_page object
*/
final public static function load($id, lesson $lesson) {
global $DB;
if (is_object($id) && !empty($id->qtype)) {
$page = $id;
} else {
$page = $DB->get_record("lesson_pages", array("id" => $id));
if (!$page) {
print_error('cannotfindpages', 'lesson');
}
}
$manager = lesson_page_type_manager::get($lesson);
$class = 'lesson_page_type_'.$manager->get_page_type_idstring($page->qtype);
if (!class_exists($class)) {
$class = 'lesson_page';
}
return new $class($page, $lesson);
}
/**
* Deletes a lesson_page from the database as well as any associated records.
* @final
* @return bool
*/
final public function delete() {
global $DB;
$cm = get_coursemodule_from_instance('lesson', $this->lesson->id, $this->lesson->course);
$context = context_module::instance($cm->id);
// Delete files associated with attempts.
$fs = get_file_storage();
if ($attempts = $DB->get_records('lesson_attempts', array("pageid" => $this->properties->id))) {
foreach ($attempts as $attempt) {
$fs->delete_area_files($context->id, 'mod_lesson', 'essay_responses', $attempt->id);
$fs->delete_area_files($context->id, 'mod_lesson', 'essay_answers', $attempt->id);
}
}
// Then delete all the associated records...
$DB->delete_records("lesson_attempts", array("pageid" => $this->properties->id));
$DB->delete_records("lesson_branch", array("pageid" => $this->properties->id));
// Delete files related to answers and responses.
if ($answers = $DB->get_records("lesson_answers", array("pageid" => $this->properties->id))) {
foreach ($answers as $answer) {
$fs->delete_area_files($context->id, 'mod_lesson', 'page_answers', $answer->id);
$fs->delete_area_files($context->id, 'mod_lesson', 'page_responses', $answer->id);
}
}
// ...now delete the answers...
$DB->delete_records("lesson_answers", array("pageid" => $this->properties->id));
// ..and the page itself
$DB->delete_records("lesson_pages", array("id" => $this->properties->id));
// Trigger an event: page deleted.
$eventparams = array(
'context' => $context,
'objectid' => $this->properties->id,
'other' => array(
'pagetype' => $this->get_typestring()
)
);
$event = \mod_lesson\event\page_deleted::create($eventparams);
$event->add_record_snapshot('lesson_pages', $this->properties);
$event->trigger();
// Delete files associated with this page.
$fs->delete_area_files($context->id, 'mod_lesson', 'page_contents', $this->properties->id);
// repair the hole in the linkage
if (!$this->properties->prevpageid && !$this->properties->nextpageid) {
//This is the only page, no repair needed
} elseif (!$this->properties->prevpageid) {
// this is the first page...
$page = $this->lesson->load_page($this->properties->nextpageid);
$page->move(null, 0);
} elseif (!$this->properties->nextpageid) {
// this is the last page...
$page = $this->lesson->load_page($this->properties->prevpageid);
$page->move(0);
} else {
// page is in the middle...
$prevpage = $this->lesson->load_page($this->properties->prevpageid);
$nextpage = $this->lesson->load_page($this->properties->nextpageid);
$prevpage->move($nextpage->id);
$nextpage->move(null, $prevpage->id);
}
return true;
}
/**
* Moves a page by updating its nextpageid and prevpageid values within
* the database
*
* @final
* @param int $nextpageid
* @param int $prevpageid
*/
final public function move($nextpageid=null, $prevpageid=null) {
global $DB;
if ($nextpageid === null) {
$nextpageid = $this->properties->nextpageid;
}
if ($prevpageid === null) {
$prevpageid = $this->properties->prevpageid;
}
$obj = new stdClass;
$obj->id = $this->properties->id;
$obj->prevpageid = $prevpageid;
$obj->nextpageid = $nextpageid;
$DB->update_record('lesson_pages', $obj);
}
/**
* Returns the answers that are associated with this page in the database
*
* @final
* @return array
*/
final public function get_answers() {
global $DB;
if ($this->answers === null) {
$this->answers = array();
$answers = $DB->get_records('lesson_answers', array('pageid'=>$this->properties->id, 'lessonid'=>$this->lesson->id), 'id');
if (!$answers) {
// It is possible that a lesson upgraded from Moodle 1.9 still
// contains questions without any answers [MDL-25632].
// debugging(get_string('cannotfindanswer', 'lesson'));
return array();
}
foreach ($answers as $answer) {
$this->answers[count($this->answers)] = new lesson_page_answer($answer);
}
}
return $this->answers;
}
/**
* Returns the lesson this page is associated with
* @final
* @return lesson
*/
final protected function get_lesson() {
return $this->lesson;
}
/**
* Returns the type of page this is. Not to be confused with page type
* @final
* @return int
*/
final protected function get_type() {
return $this->type;
}
/**
* Records an attempt at this page
*
* @final
* @global moodle_database $DB
* @param stdClass $context
* @return stdClass Returns the result of the attempt
*/
final public function record_attempt($context) {
global $DB, $USER, $OUTPUT, $PAGE;
/**
* This should be overridden by each page type to actually check the response
* against what ever custom criteria they have defined
*/
$result = $this->check_answer();
// Processes inmediate jumps.
if ($result->inmediatejump) {
return $result;
}
$result->attemptsremaining = 0;
$result->maxattemptsreached = false;
if ($result->noanswer) {
$result->newpageid = $this->properties->id; // display same page again
$result->feedback = get_string('noanswer', 'lesson');
} else {
if (!has_capability('mod/lesson:manage', $context)) {
$nretakes = $DB->count_records("lesson_grades", array("lessonid"=>$this->lesson->id, "userid"=>$USER->id));
// Get the number of attempts that have been made on this question for this student and retake,
$nattempts = $DB->count_records('lesson_attempts', array('lessonid' => $this->lesson->id,
'userid' => $USER->id, 'pageid' => $this->properties->id, 'retry' => $nretakes));
// Check if they have reached (or exceeded) the maximum number of attempts allowed.
if ($nattempts >= $this->lesson->maxattempts) {
$result->maxattemptsreached = true;
$result->feedback = get_string('maximumnumberofattemptsreached', 'lesson');
$result->newpageid = $this->lesson->get_next_page($this->properties->nextpageid);
return $result;
}
// record student's attempt
$attempt = new stdClass;
$attempt->lessonid = $this->lesson->id;
$attempt->pageid = $this->properties->id;
$attempt->userid = $USER->id;
$attempt->answerid = $result->answerid;
$attempt->retry = $nretakes;
$attempt->correct = $result->correctanswer;
if($result->userresponse !== null) {
$attempt->useranswer = $result->userresponse;
}
$attempt->timeseen = time();
// if allow modattempts, then update the old attempt record, otherwise, insert new answer record
$userisreviewing = false;
if (isset($USER->modattempts[$this->lesson->id])) {
$attempt->retry = $nretakes - 1; // they are going through on review, $nretakes will be too high
$userisreviewing = true;
}
// Only insert a record if we are not reviewing the lesson.
if (!$userisreviewing) {
if ($this->lesson->retake || (!$this->lesson->retake && $nretakes == 0)) {
$attempt->id = $DB->insert_record("lesson_attempts", $attempt);
list($updatedattempt, $updatedresult) = $this->on_after_write_attempt($attempt, $result);
if ($updatedattempt) {
$attempt = $updatedattempt;
$result = $updatedresult;
$DB->update_record("lesson_attempts", $attempt);
}
// Trigger an event: question answered.
$eventparams = array(
'context' => context_module::instance($PAGE->cm->id),
'objectid' => $this->properties->id,
'other' => array(
'pagetype' => $this->get_typestring()
)
);
$event = \mod_lesson\event\question_answered::create($eventparams);
$event->add_record_snapshot('lesson_attempts', $attempt);
$event->trigger();
// Increase the number of attempts made.
$nattempts++;
}
} else {
// When reviewing the lesson, the existing attemptid is also needed for the filearea options.
$params = [
'lessonid' => $attempt->lessonid,
'pageid' => $attempt->pageid,
'userid' => $attempt->userid,
'answerid' => $attempt->answerid,
'retry' => $attempt->retry
];
$attempt->id = $DB->get_field('lesson_attempts', 'id', $params);
}
// "number of attempts remaining" message if $this->lesson->maxattempts > 1
// displaying of message(s) is at the end of page for more ergonomic display
if (!$result->correctanswer && ($result->newpageid == 0)) {
// retreive the number of attempts left counter for displaying at bottom of feedback page
if ($nattempts >= $this->lesson->maxattempts) {
if ($this->lesson->maxattempts > 1) { // don't bother with message if only one attempt
$result->maxattemptsreached = true;
}
$result->newpageid = LESSON_NEXTPAGE;
} else if ($this->lesson->maxattempts > 1) { // don't bother with message if only one attempt
$result->attemptsremaining = $this->lesson->maxattempts - $nattempts;
}
}
}
// Determine default feedback if necessary
if (empty($result->response)) {
if (!$this->lesson->feedback && !$result->noanswer && !($this->lesson->review & !$result->correctanswer && !$result->isessayquestion)) {
// These conditions have been met:
// 1. The lesson manager has not supplied feedback to the student
// 2. Not displaying default feedback
// 3. The user did provide an answer
// 4. We are not reviewing with an incorrect answer (and not reviewing an essay question)
$result->nodefaultresponse = true; // This will cause a redirect below
} else if ($result->isessayquestion) {
$result->response = get_string('defaultessayresponse', 'lesson');
} else if ($result->correctanswer) {
$result->response = get_string('thatsthecorrectanswer', 'lesson');
} else {
$result->response = get_string('thatsthewronganswer', 'lesson');
}
}
if ($result->response) {
if ($this->lesson->review && !$result->correctanswer && !$result->isessayquestion) {
$nretakes = $DB->count_records("lesson_grades", array("lessonid"=>$this->lesson->id, "userid"=>$USER->id));
$qattempts = $DB->count_records("lesson_attempts", array("userid"=>$USER->id, "retry"=>$nretakes, "pageid"=>$this->properties->id));
if ($qattempts == 1) {
$result->feedback = $OUTPUT->box(get_string("firstwrong", "lesson"), 'feedback');
} else {
if (!$result->maxattemptsreached) {
$result->feedback = $OUTPUT->box(get_string("secondpluswrong", "lesson"), 'feedback');
} else {
$result->feedback = $OUTPUT->box(get_string("finalwrong", "lesson"), 'feedback');
}
}
} else {
$result->feedback = '';
}
$class = 'response';
if ($result->correctanswer) {
$class .= ' correct'; // CSS over-ride this if they exist (!important).
} else if (!$result->isessayquestion) {
$class .= ' incorrect'; // CSS over-ride this if they exist (!important).
}
$options = new stdClass;
$options->noclean = true;
$options->para = true;
$options->overflowdiv = true;
$options->context = $context;
$options->attemptid = isset($attempt) ? $attempt->id : null;
$result->feedback .= $OUTPUT->box(format_text($this->get_contents(), $this->properties->contentsformat, $options),
'generalbox boxaligncenter p-y-1');
$result->feedback .= '
* $result = parent::check_answer();
*
* before modifying it as required.
*
* @return stdClass
*/
public function check_answer() {
$result = new stdClass;
$result->answerid = 0;
$result->noanswer = false;
$result->correctanswer = false;
$result->isessayquestion = false; // use this to turn off review button on essay questions
$result->response = '';
$result->newpageid = 0; // stay on the page
$result->studentanswer = ''; // use this to store student's answer(s) in order to display it on feedback page
$result->studentanswerformat = FORMAT_MOODLE;
$result->userresponse = null;
$result->feedback = '';
// Store data that was POSTd by a form. This is currently used to perform any logic after the 1st write to the db
// of the attempt.
$result->postdata = false;
$result->nodefaultresponse = false; // Flag for redirecting when default feedback is turned off
$result->inmediatejump = false; // Flag to detect when we should do a jump from the page without further processing.
return $result;
}
/**
* Do any post persistence processing logic of an attempt. E.g. in cases where we need update file urls in an editor
* and we need to have the id of the stored attempt. Should be overridden in each individual child
* pagetype on a as required basis
*
* @param object $attempt The attempt corresponding to the db record
* @param object $result The result from the 'check_answer' method
* @return array False if nothing to be modified, updated $attempt and $result if update required.
*/
public function on_after_write_attempt($attempt, $result) {
return [false, false];
}
/**
* True if the page uses a custom option
*
* Should be override and set to true if the page uses a custom option.
*
* @return bool
*/
public function has_option() {
return false;
}
/**
* Returns the maximum number of answers for this page given the maximum number
* of answers permitted by the lesson.
*
* @param int $default
* @return int
*/
public function max_answers($default) {
return $default;
}
/**
* Returns the properties of this lesson page as an object
* @return stdClass;
*/
public function properties() {
$properties = clone($this->properties);
if ($this->answers === null) {
$this->get_answers();
}
if (count($this->answers)>0) {
$count = 0;
$qtype = $properties->qtype;
foreach ($this->answers as $answer) {
$properties->{'answer_editor['.$count.']'} = array('text' => $answer->answer, 'format' => $answer->answerformat);
if ($qtype != LESSON_PAGE_MATCHING) {
$properties->{'response_editor['.$count.']'} = array('text' => $answer->response, 'format' => $answer->responseformat);
} else {
$properties->{'response_editor['.$count.']'} = $answer->response;
}
$properties->{'jumpto['.$count.']'} = $answer->jumpto;
$properties->{'score['.$count.']'} = $answer->score;
$count++;
}
}
return $properties;
}
/**
* Returns an array of options to display when choosing the jumpto for a page/answer
* @static
* @param int $pageid
* @param lesson $lesson
* @return array
*/
public static function get_jumptooptions($pageid, lesson $lesson) {
global $DB;
$jump = array();
$jump[0] = get_string("thispage", "lesson");
$jump[LESSON_NEXTPAGE] = get_string("nextpage", "lesson");
$jump[LESSON_PREVIOUSPAGE] = get_string("previouspage", "lesson");
$jump[LESSON_EOL] = get_string("endoflesson", "lesson");
if ($pageid == 0) {
return $jump;
}
$pages = $lesson->load_all_pages();
if ($pages[$pageid]->qtype == LESSON_PAGE_BRANCHTABLE || $lesson->is_sub_page_of_type($pageid, array(LESSON_PAGE_BRANCHTABLE), array(LESSON_PAGE_ENDOFBRANCH, LESSON_PAGE_CLUSTER))) {
$jump[LESSON_UNSEENBRANCHPAGE] = get_string("unseenpageinbranch", "lesson");
$jump[LESSON_RANDOMPAGE] = get_string("randompageinbranch", "lesson");
}
if($pages[$pageid]->qtype == LESSON_PAGE_CLUSTER || $lesson->is_sub_page_of_type($pageid, array(LESSON_PAGE_CLUSTER), array(LESSON_PAGE_ENDOFCLUSTER))) {
$jump[LESSON_CLUSTERJUMP] = get_string("clusterjump", "lesson");
}
if (!optional_param('firstpage', 0, PARAM_INT)) {
$apageid = $DB->get_field("lesson_pages", "id", array("lessonid" => $lesson->id, "prevpageid" => 0));
while (true) {
if ($apageid) {
$title = $DB->get_field("lesson_pages", "title", array("id" => $apageid));
$jump[$apageid] = strip_tags(format_string($title,true));
$apageid = $DB->get_field("lesson_pages", "nextpageid", array("id" => $apageid));
} else {
// last page reached
break;
}
}
}
return $jump;
}
/**
* Returns the contents field for the page properly formatted and with plugin
* file url's converted
* @return string
*/
public function get_contents() {
global $PAGE;
if (!empty($this->properties->contents)) {
if (!isset($this->properties->contentsformat)) {
$this->properties->contentsformat = FORMAT_HTML;
}
$context = context_module::instance($PAGE->cm->id);
$contents = file_rewrite_pluginfile_urls($this->properties->contents, 'pluginfile.php', $context->id, 'mod_lesson',
'page_contents', $this->properties->id); // Must do this BEFORE format_text()!
return format_text($contents, $this->properties->contentsformat,
array('context' => $context, 'noclean' => true,
'overflowdiv' => true)); // Page edit is marked with XSS, we want all content here.
} else {
return '';
}
}
/**
* Set to true if this page should display in the menu block
* @return bool
*/
protected function get_displayinmenublock() {
return false;
}
/**
* Get the string that describes the options of this page type
* @return string
*/
public function option_description_string() {
return '';
}
/**
* Updates a table with the answers for this page
* @param html_table $table
* @return html_table
*/
public function display_answers(html_table $table) {
$answers = $this->get_answers();
$i = 1;
foreach ($answers as $answer) {
$cells = array();
$cells[] = ':';
$cells[] = $this->get_jump_name($answer->jumpto);
$table->data[] = new html_table_row($cells);
if ($i === 1){
$table->data[count($table->data)-1]->cells[0]->style = 'width:20%;';
}
$i++;
}
return $table;
}
/**
* Determines if this page should be grayed out on the management/report screens
* @return int 0 or 1
*/
protected function get_grayout() {
return 0;
}
/**
* Adds stats for this page to the &pagestats object. This should be defined
* for all page types that grade
* @param array $pagestats
* @param int $tries
* @return bool
*/
public function stats(array &$pagestats, $tries) {
return true;
}
/**
* Formats the answers of this page for a report
*
* @param object $answerpage
* @param object $answerdata
* @param object $useranswer
* @param array $pagestats
* @param int $i Count of first level answers
* @param int $n Count of second level answers
* @return object The answer page for this
*/
public function report_answers($answerpage, $answerdata, $useranswer, $pagestats, &$i, &$n) {
$answers = $this->get_answers();
$formattextdefoptions = new stdClass;
$formattextdefoptions->para = false; //I'll use it widely in this page
foreach ($answers as $answer) {
$data = get_string('jumpsto', 'lesson', $this->get_jump_name($answer->jumpto));
$answerdata->answers[] = array($data, "");
$answerpage->answerdata = $answerdata;
}
return $answerpage;
}
/**
* Gets an array of the jumps used by the answers of this page
*
* @return array
*/
public function get_jumps() {
global $DB;
$jumps = array();
$params = array ("lessonid" => $this->lesson->id, "pageid" => $this->properties->id);
if ($answers = $this->get_answers()) {
foreach ($answers as $answer) {
$jumps[] = $this->get_jump_name($answer->jumpto);
}
} else {
$jumps[] = $this->get_jump_name($this->properties->nextpageid);
}
return $jumps;
}
/**
* Informs whether this page type require manual grading or not
* @return bool
*/
public function requires_manual_grading() {
return false;
}
/**
* A callback method that allows a page to override the next page a user will
* see during when this page is being completed.
* @return false|int
*/
public function override_next_page() {
return false;
}
/**
* This method is used to determine if this page is a valid page
*
* @param array $validpages
* @param array $pageviews
* @return int The next page id to check
*/
public function valid_page_and_view(&$validpages, &$pageviews) {
$validpages[$this->properties->id] = 1;
return $this->properties->nextpageid;
}
/**
* Get files from the page area file.
*
* @param bool $includedirs whether or not include directories
* @param int $updatedsince return files updated since this time
* @return array list of stored_file objects
* @since Moodle 3.2
*/
public function get_files($includedirs = true, $updatedsince = 0) {
$fs = get_file_storage();
return $fs->get_area_files($this->lesson->context->id, 'mod_lesson', 'page_contents', $this->properties->id,
'itemid, filepath, filename', $includedirs, $updatedsince);
}
/**
* Make updates to the form data if required.
*
* @since Moodle 3.7
* @param stdClass $data The form data to update.
* @return stdClass The updated fom data.
*/
public function update_form_data(stdClass $data) : stdClass {
return $data;
}
}
/**
* Class used to represent an answer to a page
*
* @property int $id The ID of this answer in the database
* @property int $lessonid The ID of the lesson this answer belongs to
* @property int $pageid The ID of the page this answer belongs to
* @property int $jumpto Identifies where the user goes upon completing a page with this answer
* @property int $grade The grade this answer is worth
* @property int $score The score this answer will give
* @property int $flags Used to store options for the answer
* @property int $timecreated A timestamp of when the answer was created
* @property int $timemodified A timestamp of when the answer was modified
* @property string $answer The answer itself
* @property string $response The response the user sees if selecting this answer
*
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class lesson_page_answer extends lesson_base {
/**
* Loads an page answer from the DB
*
* @param int $id
* @return lesson_page_answer
*/
public static function load($id) {
global $DB;
$answer = $DB->get_record("lesson_answers", array("id" => $id));
return new lesson_page_answer($answer);
}
/**
* Given an object of properties and a page created answer(s) and saves them
* in the database.
*
* @param stdClass $properties
* @param lesson_page $page
* @return array
*/
public static function create($properties, lesson_page $page) {
return $page->create_answers($properties);
}
/**
* Get files from the answer area file.
*
* @param bool $includedirs whether or not include directories
* @param int $updatedsince return files updated since this time
* @return array list of stored_file objects
* @since Moodle 3.2
*/
public function get_files($includedirs = true, $updatedsince = 0) {
$lesson = lesson::load($this->properties->lessonid);
$fs = get_file_storage();
$answerfiles = $fs->get_area_files($lesson->context->id, 'mod_lesson', 'page_answers', $this->properties->id,
'itemid, filepath, filename', $includedirs, $updatedsince);
$responsefiles = $fs->get_area_files($lesson->context->id, 'mod_lesson', 'page_responses', $this->properties->id,
'itemid, filepath, filename', $includedirs, $updatedsince);
return array_merge($answerfiles, $responsefiles);
}
}
/**
* A management class for page types
*
* This class is responsible for managing the different pages. A manager object can
* be retrieved by calling the following line of code:
*
* $manager = lesson_page_type_manager::get($lesson);
*
* The first time the page type manager is retrieved the it includes all of the
* different page types located in mod/lesson/pagetypes.
*
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class lesson_page_type_manager {
/**
* An array of different page type classes
* @var array
*/
protected $types = array();
/**
* Retrieves the lesson page type manager object
*
* If the object hasn't yet been created it is created here.
*
* @staticvar lesson_page_type_manager $pagetypemanager
* @param lesson $lesson
* @return lesson_page_type_manager
*/
public static function get(lesson $lesson) {
static $pagetypemanager;
if (!($pagetypemanager instanceof lesson_page_type_manager)) {
$pagetypemanager = new lesson_page_type_manager();
$pagetypemanager->load_lesson_types($lesson);
}
return $pagetypemanager;
}
/**
* Finds and loads all lesson page types in mod/lesson/pagetypes
*
* @param lesson $lesson
*/
public function load_lesson_types(lesson $lesson) {
global $CFG;
$basedir = $CFG->dirroot.'/mod/lesson/pagetypes/';
$dir = dir($basedir);
while (false !== ($entry = $dir->read())) {
if (strpos($entry, '.')===0 || !preg_match('#^[a-zA-Z]+\.php#i', $entry)) {
continue;
}
require_once($basedir.$entry);
$class = 'lesson_page_type_'.strtok($entry,'.');
if (class_exists($class)) {
$pagetype = new $class(new stdClass, $lesson);
$this->types[$pagetype->typeid] = $pagetype;
}
}
}
/**
* Returns an array of strings to describe the loaded page types
*
* @param int $type Can be used to return JUST the string for the requested type
* @return array
*/
public function get_page_type_strings($type=null, $special=true) {
$types = array();
foreach ($this->types as $pagetype) {
if (($type===null || $pagetype->type===$type) && ($special===true || $pagetype->is_standard())) {
$types[$pagetype->typeid] = $pagetype->typestring;
}
}
return $types;
}
/**
* Returns the basic string used to identify a page type provided with an id
*
* This string can be used to instantiate or identify the page type class.
* If the page type id is unknown then 'unknown' is returned
*
* @param int $id
* @return string
*/
public function get_page_type_idstring($id) {
foreach ($this->types as $pagetype) {
if ((int)$pagetype->typeid === (int)$id) {
return $pagetype->idstring;
}
}
return 'unknown';
}
/**
* Loads a page for the provided lesson given it's id
*
* This function loads a page from the lesson when given both the lesson it belongs
* to as well as the page's id.
* If the page doesn't exist an error is thrown
*
* @param int $pageid The id of the page to load
* @param lesson $lesson The lesson the page belongs to
* @return lesson_page A class that extends lesson_page
*/
public function load_page($pageid, lesson $lesson) {
global $DB;
if (!($page =$DB->get_record('lesson_pages', array('id'=>$pageid, 'lessonid'=>$lesson->id)))) {
print_error('cannotfindpages', 'lesson');
}
$pagetype = get_class($this->types[$page->qtype]);
$page = new $pagetype($page, $lesson);
return $page;
}
/**
* This function detects errors in the ordering between 2 pages and updates the page records.
*
* @param stdClass $page1 Either the first of 2 pages or null if the $page2 param is the first in the list.
* @param stdClass $page1 Either the second of 2 pages or null if the $page1 param is the last in the list.
*/
protected function check_page_order($page1, $page2) {
global $DB;
if (empty($page1)) {
if ($page2->prevpageid != 0) {
debugging("***prevpageid of page " . $page2->id . " set to 0***");
$page2->prevpageid = 0;
$DB->set_field("lesson_pages", "prevpageid", 0, array("id" => $page2->id));
}
} else if (empty($page2)) {
if ($page1->nextpageid != 0) {
debugging("***nextpageid of page " . $page1->id . " set to 0***");
$page1->nextpageid = 0;
$DB->set_field("lesson_pages", "nextpageid", 0, array("id" => $page1->id));
}
} else {
if ($page1->nextpageid != $page2->id) {
debugging("***nextpageid of page " . $page1->id . " set to " . $page2->id . "***");
$page1->nextpageid = $page2->id;
$DB->set_field("lesson_pages", "nextpageid", $page2->id, array("id" => $page1->id));
}
if ($page2->prevpageid != $page1->id) {
debugging("***prevpageid of page " . $page2->id . " set to " . $page1->id . "***");
$page2->prevpageid = $page1->id;
$DB->set_field("lesson_pages", "prevpageid", $page1->id, array("id" => $page2->id));
}
}
}
/**
* This function loads ALL pages that belong to the lesson.
*
* @param lesson $lesson
* @return array An array of lesson_page_type_*
*/
public function load_all_pages(lesson $lesson) {
global $DB;
if (!($pages =$DB->get_records('lesson_pages', array('lessonid'=>$lesson->id)))) {
return array(); // Records returned empty.
}
foreach ($pages as $key=>$page) {
$pagetype = get_class($this->types[$page->qtype]);
$pages[$key] = new $pagetype($page, $lesson);
}
$orderedpages = array();
$lastpageid = 0;
$morepages = true;
while ($morepages) {
$morepages = false;
foreach ($pages as $page) {
if ((int)$page->prevpageid === (int)$lastpageid) {
// Check for errors in page ordering and fix them on the fly.
$prevpage = null;
if ($lastpageid !== 0) {
$prevpage = $orderedpages[$lastpageid];
}
$this->check_page_order($prevpage, $page);
$morepages = true;
$orderedpages[$page->id] = $page;
unset($pages[$page->id]);
$lastpageid = $page->id;
if ((int)$page->nextpageid===0) {
break 2;
} else {
break 1;
}
}
}
}
// Add remaining pages and fix the nextpageid links for each page.
foreach ($pages as $page) {
// Check for errors in page ordering and fix them on the fly.
$prevpage = null;
if ($lastpageid !== 0) {
$prevpage = $orderedpages[$lastpageid];
}
$this->check_page_order($prevpage, $page);
$orderedpages[$page->id] = $page;
unset($pages[$page->id]);
$lastpageid = $page->id;
}
if ($lastpageid !== 0) {
$this->check_page_order($orderedpages[$lastpageid], null);
}
return $orderedpages;
}
/**
* Fetches an mform that can be used to create/edit an page
*
* @param int $type The id for the page type
* @param array $arguments Any arguments to pass to the mform
* @return lesson_add_page_form_base
*/
public function get_page_form($type, $arguments) {
$class = 'lesson_add_page_form_'.$this->get_page_type_idstring($type);
if (!class_exists($class) || get_parent_class($class)!=='lesson_add_page_form_base') {
debugging('Lesson page type unknown class requested '.$class, DEBUG_DEVELOPER);
$class = 'lesson_add_page_form_selection';
} else if ($class === 'lesson_add_page_form_unknown') {
$class = 'lesson_add_page_form_selection';
}
return new $class(null, $arguments);
}
/**
* Returns an array of links to use as add page links
* @param int $previd The id of the previous page
* @return array
*/
public function get_add_page_type_links($previd) {
global $OUTPUT;
$links = array();
foreach ($this->types as $key=>$type) {
if ($link = $type->add_page_link($previd)) {
$links[$key] = $link;
}
}
return $links;
}
}