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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Local library file for Lesson. These are non-standard functions that are used
* only by Lesson.
*
* @package mod
* @subpackage lesson
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or late
**/
/** Make sure this isn't being directly accessed */
defined('MOODLE_INTERNAL') || die();
/** Include the files that are required by this module */
require_once($CFG->dirroot.'/course/moodleform_mod.php');
require_once($CFG->dirroot . '/mod/lesson/lib.php');
require_once($CFG->libdir . '/filelib.php');
/** This page */
define('LESSON_THISPAGE', 0);
/** Next page -> any page not seen before */
define("LESSON_UNSEENPAGE", 1);
/** Next page -> any page not answered correctly */
define("LESSON_UNANSWEREDPAGE", 2);
/** Jump to Next Page */
define("LESSON_NEXTPAGE", -1);
/** End of Lesson */
define("LESSON_EOL", -9);
/** Jump to an unseen page within a branch and end of branch or end of lesson */
define("LESSON_UNSEENBRANCHPAGE", -50);
/** Jump to Previous Page */
define("LESSON_PREVIOUSPAGE", -40);
/** Jump to a random page within a branch and end of branch or end of lesson */
define("LESSON_RANDOMPAGE", -60);
/** Jump to a random Branch */
define("LESSON_RANDOMBRANCH", -70);
/** Cluster Jump */
define("LESSON_CLUSTERJUMP", -80);
/** Undefined */
define("LESSON_UNDEFINED", -99);
/** LESSON_MAX_EVENT_LENGTH = 432000 ; 5 days maximum */
define("LESSON_MAX_EVENT_LENGTH", "432000");
//////////////////////////////////////////////////////////////////////////////////////
/// Any other lesson functions go here. Each of them must have a name that
/// starts with lesson_
/**
* Checks to see if a LESSON_CLUSTERJUMP or
* a LESSON_UNSEENBRANCHPAGE is used in a lesson.
*
* This function is only executed when a teacher is
* checking the navigation for a lesson.
*
* @param stdClass $lesson Id of the lesson that is to be checked.
* @return boolean True or false.
**/
function lesson_display_teacher_warning($lesson) {
global $DB;
// get all of the lesson answers
$params = array ("lessonid" => $lesson->id);
if (!$lessonanswers = $DB->get_records_select("lesson_answers", "lessonid = :lessonid", $params)) {
// no answers, then not using cluster or unseen
return false;
}
// just check for the first one that fulfills the requirements
foreach ($lessonanswers as $lessonanswer) {
if ($lessonanswer->jumpto == LESSON_CLUSTERJUMP || $lessonanswer->jumpto == LESSON_UNSEENBRANCHPAGE) {
return true;
}
}
// if no answers use either of the two jumps
return false;
}
/**
* Interprets the LESSON_UNSEENBRANCHPAGE jump.
*
* will return the pageid of a random unseen page that is within a branch
*
* @param lesson $lesson
* @param int $userid Id of the user.
* @param int $pageid Id of the page from which we are jumping.
* @return int Id of the next page.
**/
function lesson_unseen_question_jump($lesson, $user, $pageid) {
global $DB;
// get the number of retakes
if (!$retakes = $DB->count_records("lesson_grades", array("lessonid"=>$lesson->id, "userid"=>$user))) {
$retakes = 0;
}
// get all the lesson_attempts aka what the user has seen
if ($viewedpages = $DB->get_records("lesson_attempts", array("lessonid"=>$lesson->id, "userid"=>$user, "retry"=>$retakes), "timeseen DESC")) {
foreach($viewedpages as $viewed) {
$seenpages[] = $viewed->pageid;
}
} else {
$seenpages = array();
}
// get the lesson pages
$lessonpages = $lesson->load_all_pages();
if ($pageid == LESSON_UNSEENBRANCHPAGE) { // this only happens when a student leaves in the middle of an unseen question within a branch series
$pageid = $seenpages[0]; // just change the pageid to the last page viewed inside the branch table
}
// go up the pages till branch table
while ($pageid != 0) { // this condition should never be satisfied... only happens if there are no branch tables above this page
if ($lessonpages[$pageid]->qtype == LESSON_PAGE_BRANCHTABLE) {
break;
}
$pageid = $lessonpages[$pageid]->prevpageid;
}
$pagesinbranch = $lesson->get_sub_pages_of($pageid, array(LESSON_PAGE_BRANCHTABLE, LESSON_PAGE_ENDOFBRANCH));
// this foreach loop stores all the pages that are within the branch table but are not in the $seenpages array
$unseen = array();
foreach($pagesinbranch as $page) {
if (!in_array($page->id, $seenpages)) {
$unseen[] = $page->id;
}
}
if(count($unseen) == 0) {
if(isset($pagesinbranch)) {
$temp = end($pagesinbranch);
$nextpage = $temp->nextpageid; // they have seen all the pages in the branch, so go to EOB/next branch table/EOL
} else {
// there are no pages inside the branch, so return the next page
$nextpage = $lessonpages[$pageid]->nextpageid;
}
if ($nextpage == 0) {
return LESSON_EOL;
} else {
return $nextpage;
}
} else {
return $unseen[rand(0, count($unseen)-1)]; // returns a random page id for the next page
}
}
/**
* Handles the unseen branch table jump.
*
* @param lesson $lesson
* @param int $userid User id.
* @return int Will return the page id of a branch table or end of lesson
**/
function lesson_unseen_branch_jump($lesson, $userid) {
global $DB;
if (!$retakes = $DB->count_records("lesson_grades", array("lessonid"=>$lesson->id, "userid"=>$userid))) {
$retakes = 0;
}
$params = array ("lessonid" => $lesson->id, "userid" => $userid, "retry" => $retakes);
if (!$seenbranches = $DB->get_records_select("lesson_branch", "lessonid = :lessonid AND userid = :userid AND retry = :retry", $params,
"timeseen DESC")) {
print_error('cannotfindrecords', 'lesson');
}
// get the lesson pages
$lessonpages = $lesson->load_all_pages();
// this loads all the viewed branch tables into $seen until it finds the branch table with the flag
// which is the branch table that starts the unseenbranch function
$seen = array();
foreach ($seenbranches as $seenbranch) {
if (!$seenbranch->flag) {
$seen[$seenbranch->pageid] = $seenbranch->pageid;
} else {
$start = $seenbranch->pageid;
break;
}
}
// this function searches through the lesson pages to find all the branch tables
// that follow the flagged branch table
$pageid = $lessonpages[$start]->nextpageid; // move down from the flagged branch table
$branchtables = array();
while ($pageid != 0) { // grab all of the branch table till eol
if ($lessonpages[$pageid]->qtype == LESSON_PAGE_BRANCHTABLE) {
$branchtables[] = $lessonpages[$pageid]->id;
}
$pageid = $lessonpages[$pageid]->nextpageid;
}
$unseen = array();
foreach ($branchtables as $branchtable) {
// load all of the unseen branch tables into unseen
if (!array_key_exists($branchtable, $seen)) {
$unseen[] = $branchtable;
}
}
if (count($unseen) > 0) {
return $unseen[rand(0, count($unseen)-1)]; // returns a random page id for the next page
} else {
return LESSON_EOL; // has viewed all of the branch tables
}
}
/**
* Handles the random jump between a branch table and end of branch or end of lesson (LESSON_RANDOMPAGE).
*
* @param lesson $lesson
* @param int $pageid The id of the page that we are jumping from (?)
* @return int The pageid of a random page that is within a branch table
**/
function lesson_random_question_jump($lesson, $pageid) {
global $DB;
// get the lesson pages
$params = array ("lessonid" => $lesson->id);
if (!$lessonpages = $DB->get_records_select("lesson_pages", "lessonid = :lessonid", $params)) {
print_error('cannotfindpages', 'lesson');
}
// go up the pages till branch table
while ($pageid != 0) { // this condition should never be satisfied... only happens if there are no branch tables above this page
if ($lessonpages[$pageid]->qtype == LESSON_PAGE_BRANCHTABLE) {
break;
}
$pageid = $lessonpages[$pageid]->prevpageid;
}
// get the pages within the branch
$pagesinbranch = $lesson->get_sub_pages_of($pageid, array(LESSON_PAGE_BRANCHTABLE, LESSON_PAGE_ENDOFBRANCH));
if(count($pagesinbranch) == 0) {
// there are no pages inside the branch, so return the next page
return $lessonpages[$pageid]->nextpageid;
} else {
return $pagesinbranch[rand(0, count($pagesinbranch)-1)]->id; // returns a random page id for the next page
}
}
/**
* Calculates a user's grade for a lesson.
*
* @param object $lesson The lesson that the user is taking.
* @param int $retries The attempt number.
* @param int $userid Id of the user (optional, default current user).
* @return object { nquestions => number of questions answered
attempts => number of question attempts
total => max points possible
earned => points earned by student
grade => calculated percentage grade
nmanual => number of manually graded questions
manualpoints => point value for manually graded questions }
*/
function lesson_grade($lesson, $ntries, $userid = 0) {
global $USER, $DB;
if (empty($userid)) {
$userid = $USER->id;
}
// Zero out everything
$ncorrect = 0;
$nviewed = 0;
$score = 0;
$nmanual = 0;
$manualpoints = 0;
$thegrade = 0;
$nquestions = 0;
$total = 0;
$earned = 0;
$params = array ("lessonid" => $lesson->id, "userid" => $userid, "retry" => $ntries);
if ($useranswers = $DB->get_records_select("lesson_attempts", "lessonid = :lessonid AND
userid = :userid AND retry = :retry", $params, "timeseen")) {
// group each try with its page
$attemptset = array();
foreach ($useranswers as $useranswer) {
$attemptset[$useranswer->pageid][] = $useranswer;
}
// Drop all attempts that go beyond max attempts for the lesson
foreach ($attemptset as $key => $set) {
$attemptset[$key] = array_slice($set, 0, $lesson->maxattempts);
}
// get only the pages and their answers that the user answered
list($usql, $parameters) = $DB->get_in_or_equal(array_keys($attemptset));
array_unshift($parameters, $lesson->id);
$pages = $DB->get_records_select("lesson_pages", "lessonid = ? AND id $usql", $parameters);
$answers = $DB->get_records_select("lesson_answers", "lessonid = ? AND pageid $usql", $parameters);
// Number of pages answered
$nquestions = count($pages);
foreach ($attemptset as $attempts) {
$page = lesson_page::load($pages[end($attempts)->pageid], $lesson);
if ($lesson->custom) {
$attempt = end($attempts);
// If essay question, handle it, otherwise add to score
if ($page->requires_manual_grading()) {
$useranswerobj = unserialize($attempt->useranswer);
if (isset($useranswerobj->score)) {
$earned += $useranswerobj->score;
}
$nmanual++;
$manualpoints += $answers[$attempt->answerid]->score;
} else if (!empty($attempt->answerid)) {
$earned += $page->earned_score($answers, $attempt);
}
} else {
foreach ($attempts as $attempt) {
$earned += $attempt->correct;
}
$attempt = end($attempts); // doesn't matter which one
// If essay question, increase numbers
if ($page->requires_manual_grading()) {
$nmanual++;
$manualpoints++;
}
}
// Number of times answered
$nviewed += count($attempts);
}
if ($lesson->custom) {
$bestscores = array();
// Find the highest possible score per page to get our total
foreach ($answers as $answer) {
if(!isset($bestscores[$answer->pageid])) {
$bestscores[$answer->pageid] = $answer->score;
} else if ($bestscores[$answer->pageid] < $answer->score) {
$bestscores[$answer->pageid] = $answer->score;
}
}
$total = array_sum($bestscores);
} else {
// Check to make sure the student has answered the minimum questions
if ($lesson->minquestions and $nquestions < $lesson->minquestions) {
// Nope, increase number viewed by the amount of unanswered questions
$total = $nviewed + ($lesson->minquestions - $nquestions);
} else {
$total = $nviewed;
}
}
}
if ($total) { // not zero
$thegrade = round(100 * $earned / $total, 5);
}
// Build the grade information object
$gradeinfo = new stdClass;
$gradeinfo->nquestions = $nquestions;
$gradeinfo->attempts = $nviewed;
$gradeinfo->total = $total;
$gradeinfo->earned = $earned;
$gradeinfo->grade = $thegrade;
$gradeinfo->nmanual = $nmanual;
$gradeinfo->manualpoints = $manualpoints;
return $gradeinfo;
}
/**
* Determines if a user can view the left menu. The determining factor
* is whether a user has a grade greater than or equal to the lesson setting
* of displayleftif
*
* @param object $lesson Lesson object of the current lesson
* @return boolean 0 if the user cannot see, or $lesson->displayleft to keep displayleft unchanged
**/
function lesson_displayleftif($lesson) {
global $CFG, $USER, $DB;
if (!empty($lesson->displayleftif)) {
// get the current user's max grade for this lesson
$params = array ("userid" => $USER->id, "lessonid" => $lesson->id);
if ($maxgrade = $DB->get_record_sql('SELECT userid, MAX(grade) AS maxgrade FROM {lesson_grades} WHERE userid = :userid AND lessonid = :lessonid GROUP BY userid', $params)) {
if ($maxgrade->maxgrade < $lesson->displayleftif) {
return 0; // turn off the displayleft
}
} else {
return 0; // no grades
}
}
// if we get to here, keep the original state of displayleft lesson setting
return $lesson->displayleft;
}
/**
*
* @param $cm
* @param $lesson
* @param $page
* @return unknown_type
*/
function lesson_add_fake_blocks($page, $cm, $lesson, $timer = null) {
$bc = lesson_menu_block_contents($cm->id, $lesson);
if (!empty($bc)) {
$regions = $page->blocks->get_regions();
$firstregion = reset($regions);
$page->blocks->add_fake_block($bc, $firstregion);
}
$bc = lesson_mediafile_block_contents($cm->id, $lesson);
if (!empty($bc)) {
$page->blocks->add_fake_block($bc, $page->blocks->get_default_region());
}
if (!empty($timer)) {
$bc = lesson_clock_block_contents($cm->id, $lesson, $timer, $page);
if (!empty($bc)) {
$page->blocks->add_fake_block($bc, $page->blocks->get_default_region());
}
}
}
/**
* If there is a media file associated with this
* lesson, return a block_contents that displays it.
*
* @param int $cmid Course Module ID for this lesson
* @param object $lesson Full lesson record object
* @return block_contents
**/
function lesson_mediafile_block_contents($cmid, $lesson) {
global $OUTPUT;
if (empty($lesson->mediafile)) {
return null;
}
$options = array();
$options['menubar'] = 0;
$options['location'] = 0;
$options['left'] = 5;
$options['top'] = 5;
$options['scrollbars'] = 1;
$options['resizable'] = 1;
$options['width'] = $lesson->mediawidth;
$options['height'] = $lesson->mediaheight;
$link = new moodle_url('/mod/lesson/mediafile.php?id='.$cmid);
$action = new popup_action('click', $link, 'lessonmediafile', $options);
$content = $OUTPUT->action_link($link, get_string('mediafilepopup', 'lesson'), $action, array('title'=>get_string('mediafilepopup', 'lesson')));
$bc = new block_contents();
$bc->title = get_string('linkedmedia', 'lesson');
$bc->attributes['class'] = 'mediafile';
$bc->content = $content;
return $bc;
}
/**
* If a timed lesson and not a teacher, then
* return a block_contents containing the clock.
*
* @param int $cmid Course Module ID for this lesson
* @param object $lesson Full lesson record object
* @param object $timer Full timer record object
* @return block_contents
**/
function lesson_clock_block_contents($cmid, $lesson, $timer, $page) {
// Display for timed lessons and for students only
$context = get_context_instance(CONTEXT_MODULE, $cmid);
if(!$lesson->timed || has_capability('mod/lesson:manage', $context)) {
return null;
}
$content = '<div class="jshidewhenenabled">';
$content .= $lesson->time_remaining($timer->starttime);
$content .= '</div>';
$clocksettings = array('starttime'=>$timer->starttime, 'servertime'=>time(),'testlength'=>($lesson->maxtime * 60));
$page->requires->data_for_js('clocksettings', $clocksettings);
$page->requires->js('/mod/lesson/timer.js');
$page->requires->js_function_call('show_clock');
$bc = new block_contents();
$bc->title = get_string('timeremaining', 'lesson');
$bc->attributes['class'] = 'clock block';
$bc->content = $content;
return $bc;
}
/**
* If left menu is turned on, then this will
* print the menu in a block
*
* @param int $cmid Course Module ID for this lesson
* @param lesson $lesson Full lesson record object
* @return void
**/
function lesson_menu_block_contents($cmid, $lesson) {
global $CFG, $DB;
if (!$lesson->displayleft) {
return null;
}
$pages = $lesson->load_all_pages();
foreach ($pages as $page) {
if ((int)$page->prevpageid === 0) {
$pageid = $page->id;
break;
}
}
$currentpageid = optional_param('pageid', $pageid, PARAM_INT);
if (!$pageid || !$pages) {
return null;
}
$content = '<a href="#maincontent" class="skip">'.get_string('skip', 'lesson')."</a>\n<div class=\"menuwrapper\">\n<ul>\n";
while ($pageid != 0) {
$page = $pages[$pageid];
// Only process branch tables with display turned on
if ($page->displayinmenublock && $page->display) {
if ($page->id == $currentpageid) {
$content .= '<li class="selected">'.format_string($page->title,true)."</li>\n";
} else {
$content .= "<li class=\"notselected\"><a href=\"$CFG->wwwroot/mod/lesson/view.php?id=$cmid&amp;pageid=$page->id\">".format_string($page->title,true)."</a></li>\n";
}
}
$pageid = $page->nextpageid;
}
$content .= "</ul>\n</div>\n";
$bc = new block_contents();
$bc->title = get_string('lessonmenu', 'lesson');
$bc->attributes['class'] = 'menu block';
$bc->content = $content;
return $bc;
}
/**
* Adds header buttons to the page for the lesson
*
* @param object $cm
* @param object $context
* @param bool $extraeditbuttons
* @param int $lessonpageid
*/
function lesson_add_header_buttons($cm, $context, $extraeditbuttons=false, $lessonpageid=null) {
global $CFG, $PAGE, $OUTPUT;
if (has_capability('mod/lesson:edit', $context) && $extraeditbuttons) {
if ($lessonpageid === null) {
print_error('invalidpageid', 'lesson');
}
if (!empty($lessonpageid) && $lessonpageid != LESSON_EOL) {
$url = new moodle_url('/mod/lesson/editpage.php', array('id'=>$cm->id, 'pageid'=>$lessonpageid, 'edit'=>1));
$PAGE->set_button($OUTPUT->single_button($url, get_string('editpagecontent', 'lesson')));
}
}
}
/**
* This is a function used to detect media types and generate html code.
*
* @global object $CFG
* @global object $PAGE
* @param object $lesson
* @param object $context
* @return string $code the html code of media
*/
function lesson_get_media_html($lesson, $context) {
global $CFG, $PAGE, $OUTPUT;
require_once("$CFG->libdir/resourcelib.php");
// get the media file link
if (strpos($lesson->mediafile, '://') !== false) {
$url = new moodle_url($lesson->mediafile);
} else {
// the timemodified is used to prevent caching problems, instead of '/' we should better read from files table and use sortorder
$url = moodle_url::make_pluginfile_url($context->id, 'mod_lesson', 'mediafile', $lesson->timemodified, '/', ltrim($lesson->mediafile, '/'));
}
$title = $lesson->mediafile;
$clicktoopen = html_writer::link($url, get_string('download'));
$mimetype = resourcelib_guess_url_mimetype($url);
$extension = resourcelib_get_extension($url->out(false));
// find the correct type and print it out
if (in_array($mimetype, array('image/gif','image/jpeg','image/png'))) { // It's an image
$code = resourcelib_embed_image($url, $title);
} else if ($mimetype == 'audio/mp3') {
// MP3 audio file
$code = resourcelib_embed_mp3($url, $title, $clicktoopen);
} else if ($mimetype == 'video/x-flv' or $extension === 'f4v') {
// Flash video file
$code = resourcelib_embed_flashvideo($url, $title, $clicktoopen);
} else if ($mimetype == 'application/x-shockwave-flash') {
// Flash file
$code = resourcelib_embed_flash($url, $title, $clicktoopen);
} else if (substr($mimetype, 0, 10) == 'video/x-ms') {
// Windows Media Player file
$code = resourcelib_embed_mediaplayer($url, $title, $clicktoopen);
} else if ($mimetype == 'video/quicktime') {
// Quicktime file
$code = resourcelib_embed_quicktime($url, $title, $clicktoopen);
} else if ($mimetype == 'video/mpeg') {
// Mpeg file
$code = resourcelib_embed_mpeg($url, $title, $clicktoopen);
} else if ($mimetype == 'audio/x-pn-realaudio-plugin') {
// RealMedia file
$code = resourcelib_embed_real($url, $title, $clicktoopen);
} else {
// anything else - just try object tag enlarged as much as possible
$code = resourcelib_embed_general($url, $title, $clicktoopen, $mimetype);
}
return $code;
}
/**
* Abstract class that page type's MUST inherit from.
*
* This is the abstract class that ALL add page type forms must extend.
* You will notice that all but two of the methods this class contains are final.
* Essentially the only thing that extending classes can do is extend custom_definition.
* OR if it has a special requirement on creation it can extend construction_override
*
* @abstract
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class lesson_add_page_form_base extends moodleform {
/**
* This is the classic define that is used to identify this pagetype.
* Will be one of LESSON_*
* @var int
*/
public $qtype;
/**
* The simple string that describes the page type e.g. truefalse, multichoice
* @var string
*/
public $qtypestring;
/**
* An array of options used in the htmleditor
* @var array
*/
protected $editoroptions = array();
/**
* True if this is a standard page of false if it does something special.
* Questions are standard pages, branch tables are not
* @var bool
*/
protected $standard = true;
/**
* Each page type can and should override this to add any custom elements to
* the basic form that they want
*/
public function custom_definition() {}
/**
* Used to determine if this is a standard page or a special page
* @return bool
*/
public final function is_standard() {
return (bool)$this->standard;
}
/**
* Add the required basic elements to the form.
*
* This method adds the basic elements to the form including title and contents
* and then calls custom_definition();
*/
public final function definition() {
$mform = $this->_form;
$editoroptions = $this->_customdata['editoroptions'];
$mform->addElement('header', 'qtypeheading', get_string('addaquestionpage', 'lesson', get_string($this->qtypestring, 'lesson')));
$mform->addElement('hidden', 'id');
$mform->setType('id', PARAM_INT);
$mform->addElement('hidden', 'pageid');
$mform->setType('pageid', PARAM_INT);
if ($this->standard === true) {
$mform->addElement('hidden', 'qtype');
$mform->setType('qtype', PARAM_INT);
$mform->addElement('text', 'title', get_string('pagetitle', 'lesson'), array('size'=>70));
$mform->setType('title', PARAM_TEXT);
$mform->addRule('title', get_string('required'), 'required', null, 'client');
$this->editoroptions = array('noclean'=>true, 'maxfiles'=>EDITOR_UNLIMITED_FILES, 'maxbytes'=>$this->_customdata['maxbytes']);
$mform->addElement('editor', 'contents_editor', get_string('pagecontents', 'lesson'), null, $this->editoroptions);
$mform->setType('contents_editor', PARAM_RAW);
$mform->addRule('contents_editor', get_string('required'), 'required', null, 'client');
}
$this->custom_definition();
if ($this->_customdata['edit'] === true) {
$mform->addElement('hidden', 'edit', 1);
$this->add_action_buttons(get_string('cancel'), get_string('savepage', 'lesson'));
} else if ($this->qtype === 'questiontype') {
$this->add_action_buttons(get_string('cancel'), get_string('addaquestionpage', 'lesson'));
} else {
$this->add_action_buttons(get_string('cancel'), get_string('savepage', 'lesson'));
}
}
/**
* Convenience function: Adds a jumpto select element
*
* @param string $name
* @param string|null $label
* @param int $selected The page to select by default
*/
protected final function add_jumpto($name, $label=null, $selected=LESSON_NEXTPAGE) {
$title = get_string("jump", "lesson");
if ($label === null) {
$label = $title;
}
if (is_int($name)) {
$name = "jumpto[$name]";
}
$this->_form->addElement('select', $name, $label, $this->_customdata['jumpto']);
$this->_form->setDefault($name, $selected);
$this->_form->addHelpButton($name, 'jumps', 'lesson');
}
/**
* Convenience function: Adds a score input element
*
* @param string $name
* @param string|null $label
* @param mixed $value The default value
*/
protected final function add_score($name, $label=null, $value=null) {
if ($label === null) {
$label = get_string("score", "lesson");
}
if (is_int($name)) {
$name = "score[$name]";
}
$this->_form->addElement('text', $name, $label, array('size'=>5));
if ($value !== null) {
$this->_form->setDefault($name, $value);
}
}
/**
* Convenience function: Adds an answer editor
*
* @param int $count The count of the element to add
* @param string $label, NULL means default
* @param bool $required
* @return void
*/
protected final function add_answer($count, $label = NULL, $required = false) {
if ($label === NULL) {
$label = get_string('answer', 'lesson');
}
$this->_form->addElement('editor', 'answer_editor['.$count.']', $label, array('rows'=>'4', 'columns'=>'80'), array('noclean'=>true));
$this->_form->setDefault('answer_editor['.$count.']', array('text'=>'', 'format'=>FORMAT_MOODLE));
if ($required) {
$this->_form->addRule('answer_editor['.$count.']', get_string('required'), 'required', null, 'client');
}
}
/**
* Convenience function: Adds an response editor
*
* @param int $count The count of the element to add
* @param string $label, NULL means default
* @param bool $required
* @return void
*/
protected final function add_response($count, $label = NULL, $required = false) {
if ($label === NULL) {
$label = get_string('response', 'lesson');
}
$this->_form->addElement('editor', 'response_editor['.$count.']', $label, array('rows'=>'4', 'columns'=>'80'), array('noclean'=>true));
$this->_form->setDefault('response_editor['.$count.']', array('text'=>'', 'format'=>FORMAT_MOODLE));
if ($required) {
$this->_form->addRule('response_editor['.$count.']', get_string('required'), 'required', null, 'client');
}
}
/**
* A function that gets called upon init of this object by the calling script.
*
* This can be used to process an immediate action if required. Currently it
* is only used in special cases by non-standard page types.
*
* @return bool
*/
public function construction_override() {
return true;
}
}
/**
* Class representation of a lesson
*
* This class is used the interact with, and manage a lesson once instantiated.
* If you need to fetch a lesson object you can do so by calling
*
* <code>
* lesson::load($lessonid);
* // or
* $lessonrecord = $DB->get_record('lesson', $lessonid);
* $lesson = new lesson($lessonrecord);
* </code>
*
* 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 $highscores Flag to toggle collection of high scores
* @property int $maxhighscores Number of high scores to limit to
* @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
*
* These properties are calculated
* @property int $firstpageid Id of the first page of this lesson (prevpageid=0)
* @property int $lastpageid Id of the last page of this lesson (nextpageid=0)
*
* @copyright 2009 Sam Hemelryk
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class lesson extends lesson_base {
/**
* The id of the first page (where prevpageid = 0) gets set and retrieved by
* {@see get_firstpageid()} by directly calling <code>$lesson->firstpageid;</code>
* @var int
*/
protected $firstpageid = null;
/**
* The id of the last page (where nextpageid = 0) gets set and retrieved by
* {@see get_lastpageid()} by directly calling <code>$lesson->lastpageid;</code>
* @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;
/**
* 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');
$DB->delete_records("lesson", array("id"=>$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));
$DB->delete_records("lesson_high_scores", array("lessonid"=>$this->properties->id));
if ($events = $DB->get_records('event', array("modulename"=>'lesson', "instance"=>$this->properties->id))) {
foreach($events as $event) {
$event = calendar_event::load($event);
$event->delete();
}
}
grade_update('mod/lesson', $this->properties->course, 'mod', 'lesson', $this->properties->id, 0, NULL, array('deleted'=>1));
return true;
}
/**
* Fetches messages from the session that may have been set in previous page
* actions.
*
* <code>
* // Do not call this method directly instead use
* $lesson->messages;
* </code>
*
* @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');
}
/**
* Returns the first page for the lesson or false if there isn't one.
*
* This method should be called via the magic method __get();
* <code>
* $firstpage = $lesson->firstpage;
* </code>
*
* @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();
* <code>
* $lastpage = $lesson->lastpage;
* </code>
*
* @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;
$USER->startlesson[$this->properties->id] = true;
$startlesson = new stdClass;
$startlesson->lessonid = $this->properties->id;
$startlesson->userid = $USER->id;
$startlesson->starttime = time();
$startlesson->lessontime = time();
$DB->insert_record('lesson_timer', $startlesson);
if ($this->properties->timed) {
$this->add_message(get_string('maxtimewarning', 'lesson', $this->properties->maxtime), '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) {
global $USER, $DB;
// clock code
// get time information for this user
if (!$timer = $DB->get_records('lesson_timer', array ("lessonid" => $this->properties->id, "userid" => $USER->id), 'starttime DESC', '*', 0, 1)) {
print_error('cannotfindtimer', 'lesson');
} else {
$timer = current($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);
} else {
// starting over, so reset the clock
$timer->starttime = time();
}
}
$timer->lessontime = time();
$DB->update_record('lesson_timer', $timer);
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]);
return $this->update_timer(false, false);
}
/**
* 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 array|false
*/
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'));
}
}
}
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;
}
/**
* 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->maxtime * 60 - 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) {
if ($cluster->type !== lesson_page::TYPE_QUESTION) {
unset($clusterpages[$key]);
} elseif ($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 a cluster page
if ($lessonpages[$clusterendid]->qtype == LESSON_PAGE_CLUSTER) {
break;
}
$clusterendid = $lessonpages[$clusterendid]->prevpageid;
}
$exitjump = $DB->get_field("lesson_answers", "jumpto", array("pageid" => $clusterendid, "lessonid" => $this->properties->id));
if ($exitjump == LESSON_NEXTPAGE) {
$exitjump = $lessonpages[$pageid]->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" => $this->properties->id));
break;
}
}
}
if (!array_key_exists($exitjump, $lessonpages)) {
return LESSON_EOL;
}
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;
}
}
}
/**
* 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});
}
/**
* If overridden should create a new instance, save it in the DB and return it
*/
public static function create() {}
/**
* If overridden 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;
/**
* 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);
$lesson->add_message(get_string('insertedpage', 'lesson').': '.format_string($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;
// first delete all the associated records...
$DB->delete_records("lesson_attempts", array("pageid" => $this->properties->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" => $this->properties->id));
// repair the hole in the linkage
if (!$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;
/**
* 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();
$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));
// 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;
}
$attempt->timeseen = time();
// if allow modattempts, then update the old attempt record, otherwise, insert new answer record
if (isset($USER->modattempts[$this->lesson->id])) {
$attempt->retry = $nretakes - 1; // they are going through on review, $nretakes will be too high
}
if ($this->lesson->retake || (!$this->lesson->retake && $nretakes == 0)) {
$DB->insert_record("lesson_attempts", $attempt);
}
// "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)) {
// wrong answer and student is stuck on this page - check how many attempts
// the student has had at this page/question
$nattempts = $DB->count_records("lesson_attempts", array("pageid"=>$this->properties->id, "userid"=>$USER->id, "retry" => $attempt->retry));
// retreive the number of attempts left counter for displaying at bottom of feedback page
if ($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 - $nattempts;
}
}
}
// TODO: merge this code with the jump code below. Convert jumpto page into a proper page id
if ($result->newpageid == 0) {
$result->newpageid = $this->properties->id;
} elseif ($result->newpageid == LESSON_NEXTPAGE) {
$result->newpageid = $this->lesson->get_next_page($this->properties->nextpageid);
}
// 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 {
$result->feedback = $OUTPUT->BOX(get_string("secondpluswrong", "lesson"), 'feedback');
}
} else {
$class = 'response';
if ($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;
$result->feedback = $OUTPUT->box(format_text($this->get_contents(), $this->properties->contentsformat, $options), 'generalbox boxaligncenter');
$result->feedback .= '<div class="correctanswer generalbox"><em>'.get_string("youranswer", "lesson").'</em> : '.$result->studentanswer; // already in clean html
$result->feedback .= $OUTPUT->box($result->response, $class); // already conerted to HTML
$result->feedback .= '</div>';
}
}
}
return $result;
}
/**
* Returns the string for a jump name
*
* @final
* @param int $jumpto Jump code or page ID
* @return string
**/
final protected function get_jump_name($jumpto) {
global $DB;
static $jumpnames = array();
if (!array_key_exists($jumpto, $jumpnames)) {
if ($jumpto == LESSON_THISPAGE) {
$jumptitle = get_string('thispage', 'lesson');
} elseif ($jumpto == LESSON_NEXTPAGE) {
$jumptitle = get_string('nextpage', 'lesson');
} elseif ($jumpto == LESSON_EOL) {
$jumptitle = get_string('endoflesson', 'lesson');
} elseif ($jumpto == LESSON_UNSEENBRANCHPAGE) {
$jumptitle = get_string('unseenpageinbranch', 'lesson');
} elseif ($jumpto == LESSON_PREVIOUSPAGE) {
$jumptitle = get_string('previouspage', 'lesson');
} elseif ($jumpto == LESSON_RANDOMPAGE) {
$jumptitle = get_string('randompageinbranch', 'lesson');
} elseif ($jumpto == LESSON_RANDOMBRANCH) {
$jumptitle = get_string('randombranch', 'lesson');
} elseif ($jumpto == LESSON_CLUSTERJUMP) {
$jumptitle = get_string('clusterjump', 'lesson');
} else {
if (!$jumptitle = $DB->get_field('lesson_pages', 'title', array('id' => $jumpto))) {
$jumptitle = '<strong>'.get_string('notdefined', 'lesson').'</strong>';
}
}
$jumpnames[$jumpto] = format_string($jumptitle,true);
}
return $jumpnames[$jumpto];
}
/**
* Constructor method
* @param object $properties
* @param lesson $lesson
*/
public function __construct($properties, lesson $lesson) {
parent::__construct($properties);
$this->lesson = $lesson;
}
/**
* Returns the score for the attempt
* This may be overridden by page types that require manual grading
* @param array $answers
* @param object $attempt
* @return int
*/
public function earned_score($answers, $attempt) {
return $answers[$attempt->answerid]->score;
}
/**
* This is a callback method that can be override and gets called when ever a page
* is viewed
*
* @param bool $canmanage True if the user has the manage cap
* @return mixed
*/
public function callback_on_view($canmanage) {
return true;
}
/**
* Updates a lesson page and its answers within the database
*
* @param object $properties
* @return bool
*/
public function update($properties, $context = null, $maxbytes = null) {
global $DB, $PAGE;
$answers = $this->get_answers();
$properties->id = $this->properties->id;
$properties->lessonid = $this->lesson->id;
if (empty($properties->qoption)) {
$properties->qoption = '0';
}
if (empty($context)) {
$context = $PAGE->context;
}
if ($maxbytes === null) {
$maxbytes =get_max_upload_file_size();
}
$properties = file_postupdate_standard_editor($properties, 'contents', array('noclean'=>true, 'maxfiles'=>EDITOR_UNLIMITED_FILES, 'maxbytes'=>$maxbytes), $context, 'mod_lesson', 'page_contents', $properties->id);
$DB->update_record("lesson_pages", $properties);
for ($i = 0; $i < $this->lesson->maxanswers; $i++) {
if (!array_key_exists($i, $this->answers)) {
$this->answers[$i] = new stdClass;
$this->answers[$i]->lessonid = $this->lesson->id;
$this->answers[$i]->pageid = $this->id;
$this->answers[$i]->timecreated = $this->timecreated;
}
if (!empty($properties->answer_editor[$i]) && is_array($properties->answer_editor[$i])) {
$this->answers[$i]->answer = $properties->answer_editor[$i]['text'];
$this->answers[$i]->answerformat = $properties->answer_editor[$i]['format'];
}
if (!empty($properties->response_editor[$i]) && is_array($properties->response_editor[$i])) {
$this->answers[$i]->response = $properties->response_editor[$i]['text'];
$this->answers[$i]->responseformat = $properties->response_editor[$i]['format'];
}
// we don't need to check for isset here because properties called it's own isset method.
if ($this->answers[$i]->answer != '') {
if (isset($properties->jumpto[$i])) {
$this->answers[$i]->jumpto = $properties->jumpto[$i];
}
if ($this->lesson->custom && isset($properties->score[$i])) {
$this->answers[$i]->score = $properties->score[$i];
}
if (!isset($this->answers[$i]->id)) {
$this->answers[$i]->id = $DB->insert_record("lesson_answers", $this->answers[$i]);
} else {
$DB->update_record("lesson_answers", $this->answers[$i]->properties());
}
} else if (isset($this->answers[$i]->id)) {
$DB->delete_records('lesson_answers', array('id'=>$this->answers[$i]->id));
unset($this->answers[$i]);
}
}
return true;
}
/**
* Can be set to true if the page requires a static link to create a new instance
* instead of simply being included in the dropdown
* @param int $previd
* @return bool
*/
public function add_page_link($previd) {
return false;
}
/**
* Returns true if a page has been viewed before
*
* @param array|int $param Either an array of pages that have been seen or the
* number of retakes a user has had
* @return bool
*/
public function is_unseen($param) {
global $USER, $DB;
if (is_array($param)) {
$seenpages = $param;
return (!array_key_exists($this->properties->id, $seenpages));
} else {
$nretakes = $param;
if (!$DB->count_records("lesson_attempts", array("pageid"=>$this->properties->id, "userid"=>$USER->id, "retry"=>$nretakes))) {
return true;
}
}
return false;
}
/**
* Checks to see if a page has been answered previously
* @param int $nretakes
* @return bool
*/
public function is_unanswered($nretakes) {
global $DB, $USER;
if (!$DB->count_records("lesson_attempts", array('pageid'=>$this->properties->id, 'userid'=>$USER->id, 'correct'=>1, 'retry'=>$nretakes))) {
return true;
}
return false;
}
/**
* Creates answers within the database for this lesson_page. Usually only ever
* called when creating a new page instance
* @param object $properties
* @return array
*/
public function create_answers($properties) {
global $DB;
// now add the answers
$newanswer = new stdClass;
$newanswer->lessonid = $this->lesson->id;
$newanswer->pageid = $this->properties->id;
$newanswer->timecreated = $this->properties->timecreated;
$answers = array();
for ($i = 0; $i < $this->lesson->maxanswers; $i++) {
$answer = clone($newanswer);
if (!empty($properties->answer_editor[$i]) && is_array($properties->answer_editor[$i])) {
$answer->answer = $properties->answer_editor[$i]['text'];
$answer->answerformat = $properties->answer_editor[$i]['format'];
}
if (!empty($properties->response_editor[$i]) && is_array($properties->response_editor[$i])) {
$answer->response = $properties->response_editor[$i]['text'];
$answer->responseformat = $properties->response_editor[$i]['format'];
}
if (isset($answer->answer) && $answer->answer != '') {
if (isset($properties->jumpto[$i])) {
$answer->jumpto = $properties->jumpto[$i];
}
if ($this->lesson->custom && isset($properties->score[$i])) {
$answer->score = $properties->score[$i];
}
$answer->id = $DB->insert_record("lesson_answers", $answer);
$answers[$answer->id] = new lesson_page_answer($answer);
} else {
break;
}
}
$this->answers = $answers;
return $answers;
}
/**
* This method MUST be overridden by all question page types, or page types that
* wish to score a page.
*
* The structure of result should always be the same so it is a good idea when
* overriding this method on a page type to call
* <code>
* $result = parent::check_answer();
* </code>
* 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->userresponse = null;
$result->feedback = '';
$result->nodefaultresponse = false; // Flag for redirecting when default feedback is turned off
return $result;
}
/**
* 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) {
$count = 0;
foreach ($this->answers as $answer) {
$properties->{'answer_editor['.$count.']'} = array('text'=>$answer->answer, 'format'=>$answer->answerformat);
$properties->{'response_editor['.$count.']'} = array('text'=>$answer->response, 'format'=>$answer->responseformat);
$properties->{'jumpto['.$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 = get_context_instance(CONTEXT_MODULE, $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)); // 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[] = "<span class=\"label\">".get_string("jump", "lesson")." $i<span>: ";
$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;
}
}
/**
* 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);
}
}
/**
* 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:
* <code>
* $manager = lesson_page_type_manager::get($lesson);
* </code>
* 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 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)))) {
print_error('cannotfindpages', 'lesson');
}
foreach ($pages as $key=>$page) {
$pagetype = get_class($this->types[$page->qtype]);
$pages[$key] = new $pagetype($page, $lesson);
}
$orderedpages = array();
$lastpageid = 0;
while (true) {
foreach ($pages as $page) {
if ((int)$page->prevpageid === (int)$lastpageid) {
$orderedpages[$page->id] = $page;
unset($pages[$page->id]);
$lastpageid = $page->id;
if ((int)$page->nextpageid===0) {
break 2;
} else {
break 1;
}
}
}
}
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;
}
}
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