function get_content()
{
global $CFG, $OUTPUT, $SESSION, $PAGE;
global $USER, $COURSE, $DB;
$BLOCKNAME = "block_semantic_web";
if ($this->content !== NULL) {
return $this->content;
}
$this->content = new stdClass();
if (empty($this->instance)) {
$this->content->text = '';
return $this->content;
}
// set global variables of DASIS in cookie
$SESSION->dasis_blockId = $this->instance->id;
$SESSION->dasis_webprefs[$SESSION->dasis_blockId] = $DB->get_record("dasis_semantic_web_prefs", array("block_id" => $this->instance->id));
$SESSION->dasis_courseHasBundle = is_course_contained_by_any_bundle($COURSE->id);
if (!property_exists($SESSION, "dasis_selectedBundle")) {
$SESSION->dasis_selectedBundle = null;
}
if (!is_null($SESSION->dasis_selectedBundle)) {
$SESSION->dasis_bundleHasPath = exists_any_path_for_bundle($SESSION->dasis_selectedBundle);
} else {
$SESSION->dasis_bundleHasPath = null;
}
// set default session vars, so object's attributes are defined
if (!property_exists($SESSION, "dasis_selectedPath")) {
$SESSION->dasis_selectedPath = null;
}
/// Variablen deklarieren
$id = optional_param('id', 0, PARAM_INT);
// Prüfen, ob wir uns im courseview befinden
if (strpos($this->page->url, "/course/") === false) {
$SESSION->courseview = 0;
$SESSION->dasis_activityId = $id;
} else {
$SESSION->courseview = 1;
if (!($SESSION->dasis_activityId = $DB->get_field("dasis_last_activity", "course_module", array("userid" => $USER->id, "courseid" => $COURSE->id)))) {
$SESSION->dasis_activityId = $DB->get_field_sql("SELECT id FROM {course_modules} WHERE course = {$COURSE->id} ORDER BY added LIMIT 0,1");
}
}
// set flag, if current activity is contained by relations semantic web
if (!($SESSION->dasis_partOfWeb = $DB->record_exists_select("dasis_relations", "source = {$SESSION->dasis_activityId} OR target = {$SESSION->dasis_activityId}"))) {
$SESSION->dasis_partOfWeb = 0;
}
//if semantic web pref is not set yet, do it right here
if (!$SESSION->dasis_webprefs[$SESSION->dasis_blockId]) {
$prefs->block_id = $this->instance->id;
$prefs->depth = 2;
$prefs->adaption = 0;
$prefs->case_collection = 0;
$prefs->web_animation = 1;
$DB->insert_record("dasis_semantic_web_prefs", $prefs);
}
// Wird für das Listen-Layout des Blocks benötigt
$this->content->items = array();
$this->content->icons = array();
/**
* context needed for role management
*/
$context = get_context_instance(CONTEXT_COURSE, $COURSE->id);
/**
* Build the link list of the block
*/
// select element to choose a bundle for navigation, if course is contained by any bundle
//if(is_course_contained_by_any_bundle($COURSE->id)) {
$bundleSelectElement = "<select id=\"id_bundle_selection\" name=\"dasis_selectedBundle\">";
$bundleSelectElement .= "<option value=\"0\">" . get_string("choose_bundle", $BLOCKNAME) . "</option>";
$bundlesOfCourse = $DB->get_records("dasis_bundle_connections", array("course_id" => $COURSE->id));
foreach ($bundlesOfCourse as $bundleOfCourse) {
$bundle = $DB->get_record("dasis_bundles", array("id" => $bundleOfCourse->bundle_id));
if ($SESSION->dasis_selectedBundle == $bundle->id) {
$bundleSelectElement .= "<option selected=\"selected\" value=\"" . $bundle->id . "\">" . $bundle->name . "</option>";
} else {
$bundleSelectElement .= "<option value=\"" . $bundle->id . "\">" . $bundle->name . "</option>";
}
}
$bundleSelectElement .= "</select>";
$this->content->items[] = $bundleSelectElement;
//}
// container for the miniweb
$this->content->items[] = "<div id=\"id_miniWebContainer\"><iframe id=\"id_miniWeb\" src=\"{$CFG->wwwroot}/blocks/semantic_web/SemanticWeb/miniweb.php?id={$id}&bid=" . $this->instance->id . "\"></iframe><div id=\"id_showWeb\"></div></div>";
// if a bundle is chosen select the path to walk through the web
if ($SESSION->dasis_bundleHasPath or $SESSION->dasis_webprefs[$SESSION->dasis_blockId]->adaption) {
if ($SESSION->dasis_selectedPath !== "adapt" && $SESSION->dasis_selectedPath > 0) {
$currentLearningPathArray = unserialize($DB->get_field("dasis_learning_paths", "path", array("id" => $SESSION->dasis_selectedPath)));
// support groups in learning paths
foreach ($currentLearningPathArray as $node) {
if (!node_visible_for_user($node)) {
unset($currentLearningPathArray[array_search($node, $currentLearningPathArray)]);
$currentLearningPathArray = array_values($currentLearningPathArray);
}
}
$currentIndex = array_search($id, $currentLearningPathArray);
if ($currentIndex == 0) {
$prevIndex = 0;
$nextIndex = 1;
} elseif ($currentIndex == count($currentLearningPathArray) - 1) {
$prevIndex = $currentIndex - 1;
$nextIndex = $currentIndex;
} else {
$prevIndex = $currentIndex - 1;
$nextIndex = $currentIndex + 1;
}
//$prevNodeLink=get_url_of_coursemodule($currentLearningPathArray[$prevIndex]);
//$nextNodeLink=get_url_of_coursemodule($currentLearningPathArray[$nextIndex]);
$prevNodeLink = "{$CFG->wwwroot}/blocks/case_repository/start.php?id={$currentLearningPathArray[$prevIndex]}&backward=true&nav=path";
$nextNodeLink = "{$CFG->wwwroot}/blocks/case_repository/start.php?id={$currentLearningPathArray[$nextIndex]}&foreward=true&nav=path";
} else {
$prevNodeLink = "";
$nextNodeLink = "";
}
$pathSelection = "<div id=\"id_path_control\" style=\"text-align:center;min-width:180px;\">";
$pathSelection .= "<select id=\"id_path_select\" name=\"dasis_selectedPath\">";
$pathSelection .= "<option value=\"0\">" . get_string("select_path", $BLOCKNAME) . "</option>";
$paths = $DB->get_records("dasis_learning_paths", array("bundle_id" => $SESSION->dasis_selectedBundle));
// add option for adaptive path to select element if adaptation is switched on
if ($SESSION->dasis_webprefs[$SESSION->dasis_blockId]->adaption) {
$adaptPathOption = new object();
$adaptPathOption->id = "adapt";
$adaptPathOption->name = "Adaptiver Pfad";
$adaptPathOption->bundle_id = $SESSION->dasis_selectedBundle;
$paths[$adaptPathOption->id] = $adaptPathOption;
}
foreach ($paths as $path) {
if ($SESSION->dasis_selectedPath === $path->id) {
$pathSelection .= "<option selected=\"selected\" value=\"" . $path->id . "\">" . $path->name . "</option>";
} else {
$pathSelection .= "<option value=\"" . $path->id . "\">" . $path->name . "</option>";
}
}
$pathSelection .= "</select><br />";
// if adapt path is chosen, get last visited node, else the previous node of selected path
if ($SESSION->dasis_selectedPath === "adapt" && $SESSION->dasis_webprefs[$SESSION->dasis_blockId]->adaption) {
if (!isset($SESSION->dasis_historyPosition)) {
$SESSION->dasis_historyPosition = 0;
}
$sql = "SELECT coursemoduleid FROM {ilms_history} WHERE ";
if ($SESSION->dasis_selectedBundle > 0) {
$coursesSql = "SELECT DISTINCT course_id FROM {dasis_bundle_connections} WHERE bundle_id =" . $SESSION->dasis_selectedBundle;
} else {
$coursesSql = "SELECT DISTINCT course_id FROM {dasis_bundle_connections}";
}
$bundleCourses = new object();
if (!($bundleCourses = $DB->get_records_sql($coursesSql))) {
$bundleCourse = new object();
$bundleCourse->course_id = $COURSE->id;
$bundleCourses = array("{$COURSE->id}" => $bundleCourse);
}
$sql .= " ( ";
foreach ($bundleCourses as $bundleCourse) {
if ($bundleCourse != end($bundleCourses)) {
$sql .= " courseid = {$bundleCourse->course_id} OR";
} else {
$sql .= " courseid = {$bundleCourse->course_id}";
}
}
$sql .= " ) ";
$sql .= "AND userid = {$USER->id} ORDER BY timemodified DESC LIMIT " . ($SESSION->dasis_historyPosition + 1) . ",1";
if ($prevnodeid = $DB->get_field_sql($sql)) {
$prevNodeLink = "{$CFG->wwwroot}/blocks/case_repository/start.php?id=" . $prevnodeid . "&backward=true&nav=path";
} else {
$prevNodeLink = "#";
}
}
$pathSelection .= "<button id=\"id_button_lastNode\" name=\"lastNode\" value=\"{$prevNodeLink}\">" . get_string("back", $BLOCKNAME) . "</button>";
$pathSelection .= " <button id=\"id_button_nextNode\" name=\"nextNode\" value=\"{$nextNodeLink}\">" . get_string("next", $BLOCKNAME) . "</button>";
$pathSelection .= "</div>";
$this->content->items[] = $pathSelection;
}
// user preferences of numbers of steps in semantic web
$depthChoice = "<p><br/>" . get_string("depth", $BLOCKNAME) . ": <select id=\"id_select_depth\" name=\"userDepth\">";
if (!property_exists($SESSION, "userDepth")) {
$SESSION->userDepth = $SESSION->dasis_webprefs[$SESSION->dasis_blockId]->depth;
}
for ($i = 1; $i <= 5; $i++) {
if ($i == $SESSION->userDepth) {
$selected = "selected=\"selected\"";
} else {
$selected = "";
}
$depthChoice .= "<option {$selected} value=\"{$i}\">{$i}</option>";
}
$depthChoice .= "</select></p>";
$this->content->items[] = $depthChoice;
// open the edit metadata popup div
if (has_capability("block/semantic_web:editmetadata", $context)) {
$linkEditMetaData = "blocks/semantic_web/Metadata/edit_metadata.php?id={$id}&cv={$SESSION->courseview}";
$this->content->items[] = "<input id=\"id_linkEditMetaData\" type=\"hidden\" value=\"" . $CFG->wwwroot . "/" . $linkEditMetaData . "\"/>";
$this->content->items[] = "<a id=\"id_editMetaData\" href=\"#\">" . get_string("edit_metadata", "block_semantic_web") . "</a>";
$this->content->items[] = "<a id=\"id_show_semantic_overview\" href=\"{$CFG->wwwroot}/blocks/semantic_web/SemanticWeb/semantic_overview.php\">" . get_string("show_semantic_overview", "block_semantic_web") . "</a>";
}
// about button
$this->content->footer = $OUTPUT->help_icon("about", $BLOCKNAME);
// load javascript
$jsmodule = array('name' => 'block_semantic_web', 'fullpath' => '/blocks/semantic_web/semantic_web.js', 'requires' => array('node', 'event', 'dd-drag', 'io'));
$PAGE->requires->js_init_call('M.block_semantic_web.init_popup_actions', null, false, $jsmodule);
//$PAGE->requires->js_init_call('M.block_semantic_web.init_adaption_actions', null, false, $jsmodule);
// load js of adaption module "case repository" if adaptation is turned on
if ($SESSION->dasis_webprefs[$SESSION->dasis_blockId]->adaption) {
$js_case_repository = array('name' => 'block_case_repository', 'fullpath' => '/blocks/case_repository/case_repository.js', 'requires' => array('array-extras', 'io'));
$PAGE->requires->js_init_call('M.block_case_repository.init', null, false, $js_case_repository);
}
return $this->content;
}
/**
* Finden der Verknüpfungen eines Knotens im Semantischen Netz, auf welche der Knoten $source zeigt
*
* @param int $source Die id der Instanz, welche auf die anderen, mit ihr vernetzten Lernaktivitäten zeigt
* @return array $targets Die ids der vernetzten Lernaktivitäten, die auf source zeigt
*/
function getTargetsFromSource($source)
{
global $DB, $CFG, $SESSION;
$targets = array();
if ($SESSION->dasis_selectedBundle > 0) {
$sqlquery = "SELECT DISTINCT r.id, r.source, r.target, cm.visible\n \t\t\t\tFROM {dasis_relations} r, {course_modules} cm, {dasis_bundle_connections} bc\n \t\t\t\tWHERE {$source}=r.source AND r.target=cm.id AND cm.course=bc.course_id AND bc.bundle_id=" . $SESSION->dasis_selectedBundle;
} else {
$sqlquery = "SELECT DISTINCT r.id, r.source, r.target, cm.visible\n \t\t\t\tFROM {dasis_relations} r, {course_modules} cm, {dasis_bundle_connections} bc\n \t\t\t\tWHERE {$source}=r.source AND r.target=cm.id AND cm.course=bc.course_id";
}
$relations = $DB->get_records_sql($sqlquery);
foreach ($relations as $relation) {
if (node_visible_for_user($relation->target)) {
$targets[] = $relation->target;
}
}
return $targets;
}
