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lib.php
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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/>.
/**
* This file contains main class for Flexible sections course format.
*
* @package format_flexsections
* @copyright 2022 Marina Glancy
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot. '/course/format/lib.php');
use format_flexsections\constants;
use core\output\inplace_editable;
use format_flexsections\local\helpers\preferences;
define('FORMAT_FLEXSECTIONS_COLLAPSED', 1);
define('FORMAT_FLEXSECTIONS_EXPANDED', 0);
/**
* Main class for the Flexible sections course format.
*
* @package format_flexsections
* @copyright 2022 Marina Glancy
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class format_flexsections extends core_courseformat\base {
use preferences;
/**
* Returns true if this course format uses sections.
*
* @return bool
*/
public function uses_sections() {
return true;
}
/**
* Uses course index
*
* @return bool
*/
public function uses_course_index() {
return $this->get_course_index_display() != constants::COURSEINDEX_NONE;
}
/**
* Type of course index display
*
* @return int
*/
public function get_course_index_display(): int {
return (int)$this->get_course()->courseindexdisplay;
}
/**
* Uses indentation
*
* @return bool
*/
public function uses_indentation(): bool {
return (get_config('format_flexsections', 'indentation')) ? true : false;
}
/**
* Maximum number of subsections
*
* @return int
*/
public function get_max_section_depth(): int {
$limit = (int)get_config('format_flexsections', 'maxsectiondepth');
return max(1, min($limit, 100));
}
/**
* Accordion effect
*
* @return bool
*/
public function get_accordion_setting(): bool {
return (bool)$this->get_course()->accordion;
}
/**
* Returns the display name of the given section that the course prefers.
*
* Use section name is specified by user. Otherwise use default ("Topic #").
*
* @param int|stdClass|section_info $section Section object from database or just field section.section
* @return string Display name that the course format prefers, e.g. "Topic 2"
*/
public function get_section_name($section) {
if (!is_object($section)) {
$section = $this->get_section($section);
}
if ((string)$section->name !== '') {
return format_string($section->name, true,
['context' => context_course::instance($this->courseid)]);
} else {
return $this->get_default_section_name($section);
}
}
/**
* Returns the depth of the section in hierarchy
*
* For example, top section has depth 1, subsection of top section has depth 2,
* its subsection has depth 3.
*
* @param section_info $section
* @return int Depth of the section in hierarchy.
*/
public function get_section_depth(section_info $section): int {
$parent = $this->get_section($section->parent);
return $parent && $parent->section ? $this->get_section_depth($parent) + 1 : 1;
}
/**
* Returns the default section name for the flexsections course format.
*
* If the section number is 0, it will use the string with key = section0name from the course format's lang file.
* If the section number is not 0, the base implementation of course_format::get_default_section_name which uses
* the string with the key = 'sectionname' from the course format's lang file + the section number will be used.
*
* @param stdClass|section_info $section Section object from database or just field course_sections section
* @return string The default value for the section name.
*/
public function get_default_section_name($section) {
if ($section->section == 0) {
// Return the general section.
return get_string('section0name', 'format_flexsections');
} else {
// Use course_format::get_default_section_name implementation which
// will display the section name in "Topic n" format.
return parent::get_default_section_name($section);
}
}
/**
* Generate the title for this section page.
*
* @return string the page title
*/
public function page_title(): string {
global $CFG;
if ((int)$CFG->branch >= 404) {
// TODO it is possible it is not used anymore. Review.
return 'Topic outline';
} else {
return get_string('topicoutline');
}
}
/**
* Returns the section relative number regardless whether argument is an object or an int
*
* @param int|section_info $section
* @return ?int
*/
protected function resolve_section_number($section) {
if ($section === null || $section === '') {
return null;
} else if (is_object($section)) {
return $section->section;
} else {
return (int)$section;
}
}
/**
* The URL to use for the specified course (with section).
*
* @param int|stdClass $section Section object from database or just field course_sections.section
* if omitted the course view page is returned
* @param array $options options for view URL. At the moment core uses:
* 'navigation' (bool) if true and section has no separate page, the function returns null
* 'sr' (int) used by multipage formats to specify to which section to return
* @return null|moodle_url
*/
public function get_view_url($section, $options = []) {
$url = new moodle_url('/course/view.php', ['id' => $this->courseid]);
$sectionno = $this->resolve_section_number($section);
$section = $this->get_section($sectionno);
if ($sectionno && !$this->is_section_visible($section)) {
return empty($options['navigation']) ? $url : null;
}
if (array_key_exists('sr', $options)) {
// Return to the page for section with number $sr.
$url->param('section', $options['sr']);
if ($sectionno) {
$url->set_anchor('section-'.$sectionno);
}
} else if ($sectionno) {
// Check if this section has separate page.
if ($section->collapsed == FORMAT_FLEXSECTIONS_COLLAPSED) {
$url->param('section', $section->section);
return $url;
}
// Find the parent (or grandparent) page that is displayed on separate page.
if ($parent = $this->find_collapsed_parent($section->parent)) {
$url->param('section', $parent);
}
$url->set_anchor('section-'.$sectionno);
}
return $url;
}
/**
* Returns the information about the ajax support in the given source format.
*
* The returned object's property (boolean)capable indicates that
* the course format supports Moodle course ajax features.
*
* @return stdClass
*/
public function supports_ajax() {
$ajaxsupport = new stdClass();
$ajaxsupport->capable = true;
return $ajaxsupport;
}
/**
* Supports components
*
* @return bool
*/
public function supports_components() {
return true;
}
/**
* Loads all of the course sections into the navigation.
*
* @param global_navigation $navigation
* @param navigation_node $node The course node within the navigation
* @return void
*/
public function extend_course_navigation($navigation, navigation_node $node) {
// If course format displays section on separate pages and we are on course/view.php page
// and the section parameter is specified, make sure this section is expanded in
// navigation.
if ($navigation->includesectionnum === false && $this->get_viewed_section() &&
(!defined('AJAX_SCRIPT') || AJAX_SCRIPT == '0')) {
$navigation->includesectionnum = $this->get_viewed_section();
}
$modinfo = get_fast_modinfo($this->courseid);
if (!empty($modinfo->sections[0])) {
foreach ($modinfo->sections[0] as $cmid) {
$this->navigation_add_activity($node, $modinfo->get_cm($cmid));
}
}
foreach ($modinfo->get_section_info_all() as $section) {
if ($section->parent == 0 && $section->section != 0) {
$this->navigation_add_section($navigation, $node, $section);
}
}
}
/**
* Adds a course module to the navigation node
*
* @param navigation_node $node
* @param cm_info $cm
* @return null|navigation_node
*/
protected function navigation_add_activity(navigation_node $node, cm_info $cm): ?navigation_node {
if (!$cm->uservisible || !$cm->has_view()) {
return null;
}
$activityname = $cm->get_formatted_name();
$action = $cm->url;
if ($cm->icon) {
$icon = new pix_icon($cm->icon, $cm->modfullname, $cm->iconcomponent);
} else {
$icon = new pix_icon('icon', $cm->modfullname, $cm->modname);
}
$activitynode = $node->add($activityname, $action, navigation_node::TYPE_ACTIVITY, null, $cm->id, $icon);
if (global_navigation::module_extends_navigation($cm->modname)) {
$activitynode->nodetype = navigation_node::NODETYPE_BRANCH;
} else {
$activitynode->nodetype = navigation_node::NODETYPE_LEAF;
}
if (method_exists($cm, 'is_visible_on_course_page')) {
$activitynode->display = $cm->is_visible_on_course_page();
}
return $activitynode;
}
/**
* Adds a section to navigation node, loads modules and subsections if necessary
*
* @param global_navigation $navigation
* @param navigation_node $node
* @param section_info $section
* @return null|navigation_node
*/
protected function navigation_add_section($navigation, navigation_node $node, section_info $section): ?navigation_node {
if (!$section->uservisible) {
return null;
}
$sectionname = get_section_name($this->get_course(), $section);
$url = course_get_url($this->get_course(), $section->section, ['navigation' => true]);
$sectionnode = $node->add($sectionname, $url, navigation_node::TYPE_SECTION, null, $section->id);
$sectionnode->nodetype = navigation_node::NODETYPE_BRANCH;
$sectionnode->hidden = !$section->visible || !$section->available;
if ($section->section == $this->get_viewed_section()) {
$sectionnode->force_open();
}
if ($this->section_has_parent($navigation->includesectionnum, $section->section)
|| $navigation->includesectionnum == $section->section) {
$modinfo = get_fast_modinfo($this->courseid);
if (!empty($modinfo->sections[$section->section])) {
foreach ($modinfo->sections[$section->section] as $cmid) {
$this->navigation_add_activity($sectionnode, $modinfo->get_cm($cmid));
}
}
foreach ($modinfo->get_section_info_all() as $subsection) {
if ($subsection->parent == $section->section && $subsection->section != 0) {
$this->navigation_add_section($navigation, $sectionnode, $subsection);
}
}
}
return $sectionnode;
}
/**
* Custom action after section has been moved in AJAX mode.
*
* Used in course/rest.php
*
* @return array This will be passed in ajax respose
*/
public function ajax_section_move() {
global $PAGE;
$titles = [];
$course = $this->get_course();
$modinfo = get_fast_modinfo($course);
$renderer = $this->get_renderer($PAGE);
if ($renderer && ($sections = $modinfo->get_section_info_all())) {
foreach ($sections as $number => $section) {
$titles[$number] = $renderer->section_title($section, $course);
}
}
return ['sectiontitles' => $titles, 'action' => 'move'];
}
/**
* Returns the list of blocks to be automatically added for the newly created course.
*
* @return array of default blocks, must contain two keys BLOCK_POS_LEFT and BLOCK_POS_RIGHT
* each of values is an array of block names (for left and right side columns)
*/
public function get_default_blocks() {
return [
BLOCK_POS_LEFT => [],
BLOCK_POS_RIGHT => [],
];
}
/**
* Definitions of the additional options that this course format uses for section
*
* See {@see format_base::course_format_options()} for return array definition.
*
* Additionally section format options may have property 'cache' set to true
* if this option needs to be cached in {@see get_fast_modinfo()}. The 'cache' property
* is recommended to be set only for fields used in {@see format_base::get_section_name()},
* {@see format_base::extend_course_navigation()} and {@see format_base::get_view_url()}
*
* For better performance cached options are recommended to have 'cachedefault' property
* Unlike 'default', 'cachedefault' should be static and not access get_config().
*
* Regardless of value of 'cache' all options are accessed in the code as
* $sectioninfo->OPTIONNAME
* where $sectioninfo is instance of section_info, returned by
* get_fast_modinfo($course)->get_section_info($sectionnum)
* or get_fast_modinfo($course)->get_section_info_all()
*
* All format options for particular section are returned by calling:
* $this->get_format_options($section);
*
* @param bool $foreditform
* @return array
*/
public function section_format_options($foreditform = false): array {
return [
'parent' => [
'type' => PARAM_INT,
'label' => '',
'element_type' => 'hidden',
'default' => 0,
'cache' => true,
'cachedefault' => 0,
],
'visibleold' => [
'type' => PARAM_INT,
'label' => '',
'element_type' => 'hidden',
'default' => 1,
'cache' => true,
'cachedefault' => 0,
],
'collapsed' => [
'type' => PARAM_INT,
'label' => get_string('displaycontent', 'format_flexsections'),
'element_type' => 'select',
'element_attributes' => [
[
FORMAT_FLEXSECTIONS_EXPANDED => new lang_string('showexpanded', 'format_flexsections'),
FORMAT_FLEXSECTIONS_COLLAPSED => new lang_string('showcollapsed', 'format_flexsections'),
],
],
'cache' => true,
'cachedefault' => FORMAT_FLEXSECTIONS_EXPANDED,
'default' => COURSE_DISPLAY_SINGLEPAGE,
],
];
}
/**
* Definitions of the additional options that this course format uses for course.
*
* Flexsections format uses the following options:
* - showsection0title
*
* @param bool $foreditform
* @return array of options
*/
public function course_format_options($foreditform = false) {
static $courseformatoptions = false;
if ($courseformatoptions === false) {
$courseformatoptions = [
'showsection0title' => [
'default' => get_config('format_flexsections', 'showsection0titledefault') ?? 0,
'type' => PARAM_BOOL,
],
'courseindexdisplay' => [
'default' => get_config('format_flexsections', 'courseindexdisplay') ?? 0,
'type' => PARAM_INT,
],
'accordion' => [
'default' => (bool)get_config('format_flexsections', 'accordion'),
'type' => PARAM_BOOL,
],
'cmbacklink' => [
'default' => (bool)get_config('format_flexsections', 'cmbacklink'),
'type' => PARAM_BOOL,
],
];
}
if ($foreditform && !isset($courseformatoptions['showsection0title']['label'])) {
$options = [
constants::COURSEINDEX_FULL => get_string('courseindexfull', 'format_flexsections'),
constants::COURSEINDEX_SECTIONS => get_string('courseindexsections', 'format_flexsections'),
constants::COURSEINDEX_NONE => get_string('courseindexnone', 'format_flexsections'),
];
$courseformatoptionsedit = [
'showsection0title' => [
'label' => new lang_string('showsection0title', 'format_flexsections'),
'help' => 'showsection0title',
'help_component' => 'format_flexsections',
'element_type' => 'advcheckbox',
],
'courseindexdisplay' => [
'label' => new lang_string('courseindexdisplay', 'format_flexsections'),
'element_type' => 'select',
'element_attributes' => [$options],
],
'accordion' => [
'label' => new lang_string('accordion', 'format_flexsections'),
'element_type' => 'advcheckbox',
],
'cmbacklink' => [
'label' => new lang_string('cmbacklink', 'format_flexsections'),
'element_type' => 'advcheckbox',
],
];
$courseformatoptions = array_merge_recursive($courseformatoptions, $courseformatoptionsedit);
}
return $courseformatoptions;
}
/**
* Adds format options elements to the course/section edit form.
*
* This function is called from {@see course_edit_form::definition_after_data()}.
*
* @param MoodleQuickForm $mform form the elements are added to.
* @param bool $forsection 'true' if this is a section edit form, 'false' if this is course edit form.
* @return array array of references to the added form elements.
*/
public function create_edit_form_elements(&$mform, $forsection = false) {
global $COURSE;
$elements = parent::create_edit_form_elements($mform, $forsection);
if (!$forsection && (empty($COURSE->id) || $COURSE->id == SITEID)) {
// Add "numsections" element to the create course form - it will force new course to be prepopulated
// with empty sections.
// The "Number of sections" option is no longer available when editing course, instead teachers should
// delete and add sections when needed.
$courseconfig = get_config('moodlecourse');
$max = (int)$courseconfig->maxsections;
$element = $mform->addElement('select', 'numsections', get_string('numberweeks'), range(0, $max ?: 52));
$mform->setType('numsections', PARAM_INT);
if (is_null($mform->getElementValue('numsections'))) {
$mform->setDefault('numsections', $courseconfig->numsections);
}
array_unshift($elements, $element);
}
return $elements;
}
/**
* Whether this format allows to delete sections.
*
* Do not call this function directly, instead use {@see course_can_delete_section()}
*
* @param int|stdClass|section_info $section
* @return bool
*/
public function can_delete_section($section) {
return true;
}
/**
* Prepares the templateable object to display section name.
*
* @param \section_info|\stdClass $section
* @param bool $linkifneeded
* @param bool $editable
* @param null|lang_string|string $edithint
* @param null|lang_string|string $editlabel
* @return inplace_editable|void
*/
public function inplace_editable_render_section_name($section, $linkifneeded = true,
$editable = null, $edithint = null, $editlabel = null) {
if (empty($edithint)) {
$edithint = new lang_string('editsectionname', 'format_flexsections');
}
if (empty($editlabel)) {
$title = get_section_name($section->course, $section);
$editlabel = new lang_string('newsectionname', 'format_flexsections', $title);
}
$section = $this->get_section($section);
if ($linkifneeded && $section->collapsed != FORMAT_FLEXSECTIONS_COLLAPSED) {
$linkifneeded = false;
}
return parent::inplace_editable_render_section_name($section, $linkifneeded, $editable, $edithint, $editlabel);
}
/**
* Indicates whether the course format supports the creation of a news forum.
*
* @return bool
*/
public function supports_news() {
return true;
}
/**
* Returns whether this course format allows the activity to
* have "triple visibility state" - visible always, hidden on course page but available, hidden.
*
* @param stdClass|cm_info $cm course module (may be null if we are displaying a form for adding a module)
* @param stdClass|section_info $section section where this module is located or will be added to
* @return bool
*/
public function allow_stealth_module_visibility($cm, $section) {
// Allow the third visibility state inside visible sections or in section 0.
return !$section->section || $section->visible;
}
/**
* Callback used in WS core_course_edit_section when teacher performs an AJAX action on a section (show/hide).
*
* Access to the course is already validated in the WS but the callback has to make sure
* that particular action is allowed by checking capabilities
*
* Course formats should register.
*
* @param section_info|stdClass $section
* @param string $action
* @param int $sr
* @return null|array any data for the Javascript post-processor (must be json-encodeable)
*/
public function section_action($section, $action, $sr) {
global $PAGE;
if ($section->section && ($action === 'setmarker' || $action === 'removemarker')) {
// Format 'flexsections' allows to set and remove markers in addition to common section actions.
require_capability('moodle/course:setcurrentsection', context_course::instance($this->courseid));
course_set_marker($this->courseid, ($action === 'setmarker') ? $section->section : 0);
return null;
}
if ($section->section && ($action === 'showexpanded' || $action === 'showcollapsed')) {
require_capability('moodle/course:update', context_course::instance($this->courseid));
$newvalue = ($action === 'showexpanded') ? FORMAT_FLEXSECTIONS_EXPANDED : FORMAT_FLEXSECTIONS_COLLAPSED;
course_update_section($this->courseid, $section, ['collapsed' => $newvalue]);
// TODO what to return?
return null;
}
$mergeup = optional_param('mergeup', null, PARAM_INT);
if ($mergeup && has_capability('moodle/course:update', context_course::instance($this->courseid))) {
require_sesskey();
$section = $this->get_section($mergeup, MUST_EXIST);
$this->mergeup_section($section);
$url = course_get_url($this->courseid, $section->parent);
redirect($url);
}
// For show/hide actions call the parent method and return the new content for .section_availability element.
$rv = parent::section_action($section, $action, $sr);
$renderer = $PAGE->get_renderer('format_flexsections');
if (!($section instanceof section_info)) {
$modinfo = course_modinfo::instance($this->courseid);
$section = $modinfo->get_section_info($section->section);
}
$elementclass = $this->get_output_classname('content\\section\\availability');
$availability = new $elementclass($this, $section);
$rv['section_availability'] = $renderer->render($availability);
return $rv;
}
/**
* Return the plugin configs for external functions.
*
* @return array the list of configuration settings
*/
public function get_config_for_external() {
// Return everything (nothing to hide).
return $this->get_format_options();
}
/**
* Checks if section is really available for the current user (analyses parent section available)
*
* @deprecated since Moodle 4.5
* @param int|section_info $section
* @return bool
*/
public function is_section_real_available($section) {
if (($this->resolve_section_number($section) == 0)) {
// Section 0 is always available.
return true;
}
$context = context_course::instance($this->courseid);
if (has_capability('moodle/course:viewhiddensections', $context)) {
// For the purpose of this function only return true for teachers.
return true;
}
$section = $this->get_section($section);
return $section->available;
}
/**
* Returns either section or it's parent or grandparent, whoever first is collapsed
*
* @param int|section_info $section
* @param bool $returnid
* @return int
*/
public function find_collapsed_parent($section, $returnid = false) {
$section = $this->get_section($section);
if (!$section->section || $section->collapsed == FORMAT_FLEXSECTIONS_COLLAPSED) {
return $returnid ? $section->id : $section->section;
} else {
return $this->find_collapsed_parent($section->parent, $returnid);
}
}
/**
* URL of the page from where this function was called (use referer if this is an AJAX request)
*
* @return moodle_url
*/
protected function get_caller_page_url(): moodle_url {
global $PAGE, $FULLME;
$url = $PAGE->has_set_url() ? $PAGE->url : new moodle_url($FULLME);
if ($url->compare(new moodle_url('/lib/ajax/service.php'), URL_MATCH_BASE)) {
return !empty($_SERVER['HTTP_REFERER']) ? new moodle_url($_SERVER['HTTP_REFERER']) : $url;
}
return $url;
}
/**
* Returns true if we are on /course/view.php page
*
* @return bool
*/
public function on_course_view_page() {
$url = $this->get_caller_page_url();
return ($url && $url->compare(new moodle_url('/course/view.php'), URL_MATCH_BASE));
}
/**
* If we are on course/view.php page return the 'section' attribute from query
*
* @return int
*/
public function get_viewed_section() {
if ($this->on_course_view_page()) {
if ($s = $this->get_caller_page_url()->get_param('section')) {
return (int)$s;
}
$sid = $this->get_caller_page_url()->get_param('sectionid');
if ($sid && ($section = $this->get_modinfo()->get_section_info_by_id($sid))) {
return $section->section;
}
}
return 0;
}
/**
* Is this section displayed on the current page
*
* Used in course index
*
* @param int $sectionnum
* @return bool
*/
public function is_section_displayed_on_current_page(int $sectionnum): bool {
$viewedsection = $this->get_viewed_section();
if ($viewedsection) {
return $sectionnum == $viewedsection || $this->section_has_parent($sectionnum, $viewedsection);
} else {
$section = $this->get_section($sectionnum);
if (!$section->parent) {
return true;
}
return $this->find_collapsed_parent($section->parent) ? false : true;
}
}
/**
* Create a new section under given parent
*
* @param int|section_info $parent parent section
* @param null|int|section_info $before
* @return int $sectionnum
*/
public function create_new_section($parent = 0, $before = null): int {
$section = course_create_section($this->courseid, 0);
$sectionnum = $this->move_section($section, $parent, $before);
return $sectionnum;
}
/**
* Allows course format to execute code on moodle_page::set_course()
*
* format_flexsections processes additional attributes in the view course URL
* to manipulate sections and redirect to course view page
*
* @param moodle_page $page instance of page calling set_course
*/
public function page_set_course(moodle_page $page) {
global $PAGE;
if ($PAGE != $page) {
return;
}
if ($this->on_course_view_page()) {
$context = context_course::instance($this->courseid);
$currentsectionnum = $this->get_viewed_section();
// Fix the section argument.
if ($currentsectionnum && !optional_param('duplicatesection', 0, PARAM_INT)) {
$sectioninfo = $this->get_modinfo()->get_section_info($currentsectionnum);
if (!$sectioninfo || !$sectioninfo->collapsed) {
redirect(course_get_url($this->get_course(), $sectioninfo ? $this->find_collapsed_parent($sectioninfo) : null));
}
}
if ($currentsectionnum) {
navigation_node::override_active_url(new moodle_url('/course/view.php',
['id' => $this->courseid,
'section' => $currentsectionnum]));
}
// If requested, create new section and redirect to course view page.
$addchildsection = optional_param('addchildsection', null, PARAM_INT);
if ($addchildsection !== null && has_capability('moodle/course:update', $context)) {
$sectionnum = $this->create_new_section($addchildsection);
$url = course_get_url($this->courseid, $sectionnum);
redirect($url);
}
// If requested, merge the section content with parent and remove the section.
$mergeup = optional_param('mergeup', null, PARAM_INT);
if ($mergeup && confirm_sesskey() && has_capability('moodle/course:update', $context)) {
$section = $this->get_section($mergeup, MUST_EXIST);
$this->mergeup_section($section);
$url = course_get_url($this->courseid, $section->parent);
redirect($url);
}
// If requested, delete the section.
$deletesection = optional_param('deletesection', null, PARAM_INT);
if ($deletesection && confirm_sesskey() && has_capability('moodle/course:update', $context)
&& optional_param('confirm', 0, PARAM_INT) == 1) {
$section = $this->get_section($deletesection, MUST_EXIST);
$parent = $section->parent;
$this->delete_section_with_children($section);
$url = course_get_url($this->courseid, $parent);
redirect($url);
}
// If requested, move section.
$movesection = optional_param('movesection', null, PARAM_INT);
$moveparent = optional_param('moveparent', null, PARAM_INT);
$movebefore = optional_param('movebefore', null, PARAM_RAW);
$sr = optional_param('sr', null, PARAM_RAW);
$options = [];
if ($sr !== null) {
$options = ['sr' => $sr];
}
if ($movesection !== null && $moveparent !== null && has_capability('moodle/course:update', $context)) {
$newsectionnum = $this->move_section($movesection, $moveparent, $movebefore);
redirect(course_get_url($this->courseid, $newsectionnum, $options));
}
// If requested, switch collapsed attribute.
$switchcollapsed = optional_param('switchcollapsed', null, PARAM_INT);
if ($switchcollapsed && confirm_sesskey() && has_capability('moodle/course:update', $context)
&& ($section = $this->get_section($switchcollapsed))) {
if ($section->collapsed == FORMAT_FLEXSECTIONS_EXPANDED) {
$newvalue = FORMAT_FLEXSECTIONS_COLLAPSED;
} else {
$newvalue = FORMAT_FLEXSECTIONS_EXPANDED;
}
$this->update_section_format_options(['id' => $section->id, 'collapsed' => $newvalue]);
if ($newvalue == FORMAT_FLEXSECTIONS_COLLAPSED) {
if (!isset($options['sr'])) {
$options['sr'] = $this->find_collapsed_parent($section->parent);
}
redirect(course_get_url($this->courseid, $switchcollapsed, $options));
} else {
redirect(course_get_url($this->courseid, $switchcollapsed, $options));
}
}
// Set course marker if required.
$marker = optional_param('marker', null, PARAM_INT);
if ($marker !== null && has_capability('moodle/course:setcurrentsection', $context) && confirm_sesskey()) {
if ($marker > 0) {
// Set marker.
$url = course_get_url($this->courseid, $marker, ['sr' => $this->get_viewed_section()]);
course_set_marker($this->courseid, $marker);
redirect($url);
} else if ($this->get_course()->marker) {
// Remove marker.
$url = course_get_url($this->courseid, $this->get_course()->marker,
['sr' => $this->get_viewed_section()]);
course_set_marker($this->courseid, 0);
redirect($url);
}
}
// Change visibility if required.
$hide = optional_param('hide', null, PARAM_INT);
if ($hide !== null && has_capability('moodle/course:sectionvisibility', $context) && confirm_sesskey()) {
$url = course_get_url($this->courseid, $hide, ['sr' => $this->get_viewed_section()]);
$this->set_section_visible($hide, 0);
redirect($url);
}
$show = optional_param('show', null, PARAM_INT);
if ($show !== null && has_capability('moodle/course:sectionvisibility', $context) && confirm_sesskey()) {
$url = course_get_url($this->courseid, $show, ['sr' => $this->get_viewed_section()]);
$this->set_section_visible($show, 1);
redirect($url);
}
}
}
/**
* Moves section to the specified position
*
* @param int|section_info $section
* @param int|section_info $parent
* @param null|int|section_info $before
* @return int new section number
*/
public function move_section($section, $parent, $before = null) {
global $DB;
$section = $this->get_section($section);
$parent = $this->get_section($parent);
$newsectionnumber = $section->section;
if (!$this->can_move_section_to($section, $parent, $before)) {
return $newsectionnumber;
}
if ($section->visible != $parent->visible && $section->parent != $parent->section) {
// Section is changing parent and new parent has different visibility than the section.
if ($section->visible) {
// Visible section is moved under hidden parent.
$updatesectionvisible = 0;
$updatesectionvisibleold = 1;
} else {
// Hidden section is moved under visible parent.
if ($section->visibleold) {
$updatesectionvisible = 1;
$updatesectionvisibleold = 1;
}
}
}
// Find the changes in the sections numbering.
$origorder = [];
foreach ($this->get_sections() as $subsection) {
$origorder[$subsection->id] = $subsection->section;
}
$neworder = [];
$this->reorder_sections($neworder, 0, $section->section, $parent, $before);
if (count($origorder) != count($neworder)) {
die('Error in sections hierarchy'); // TODO.
}
$changes = [];
foreach ($origorder as $id => $num) {
if ($num == $section->section) {
$newsectionnumber = $neworder[$id];
}
if ($num != $neworder[$id]) {
$changes[$id] = ['old' => $num, 'new' => $neworder[$id]];
if ($num && $this->get_course()->marker == $num) {
$changemarker = $neworder[$id];
}
}
if ($this->resolve_section_number($parent) === $num) {
$newparentnum = $neworder[$id];
}
}
if (empty($changes) && $newparentnum == $section->parent) {
return $newsectionnumber;
}
// Build array of required changes in field 'parent'.
$changeparent = [];
foreach ($this->get_sections() as $subsection) {
foreach ($changes as $id => $change) {
if ($subsection->parent == $change['old']) {
$changeparent[$subsection->id] = $change['new'];
}
}
}
$changeparent[$section->id] = $newparentnum;
// Update all in database in one transaction.
$transaction = $DB->start_delegated_transaction();
// Update sections numbers in 2 steps to avoid breaking database uniqueness constraint.
foreach ($changes as $id => $change) {
$DB->set_field('course_sections', 'section', -$change['new'], ['id' => $id]);
}
foreach ($changes as $id => $change) {
$DB->set_field('course_sections', 'section', $change['new'], ['id' => $id]);
}
// Change parents of their subsections.
foreach ($changeparent as $id => $newnum) {
$this->update_section_format_options(['id' => $id, 'parent' => $newnum]);
}
$transaction->allow_commit();
rebuild_course_cache($this->courseid, true);
if (isset($changemarker)) {
course_set_marker($this->courseid, $changemarker);
}
if (isset($updatesectionvisible)) {
$this->set_section_visible($newsectionnumber, $updatesectionvisible, $updatesectionvisibleold);
}
return $newsectionnumber;
}
/**
* Sets the section visible/hidden including subsections and modules
*
* @param int|stdClass|section_info $section
* @param int $visibility
* @param null|int $setvisibleold if specified in case of hiding the section,
* this will be the value of visibleold for the section $section.