if (!($sections = $modinfo->get_section_info_all())) {
    // No sections found
    $section = new stdClass();
    $section->course = $course->id;
    // Create a default section.
    $section->section = 0;
    $section->visible = 1;
    $section->summaryformat = FORMAT_HTML;
    $section->id = $DB->insert_record('course_sections', $section);
    rebuild_course_cache($course->id);
    $modinfo = get_fast_modinfo($COURSE);
    if (!($sections = $modinfo->get_section_info_all())) {
        // Try again
        print_error('cannotcreateorfindstructs', 'error');
    }
}
// CAUTION, hacky fundamental variable defintion to follow!
// Note that because of the way course fromats are constructed though
// inclusion we pass parameters around this way..
$displaysection = $section;
// Include the actual course format.
require $CFG->dirroot . '/course/format/' . $course->format . '/format.php';
// Content wrapper end.
echo html_writer::end_tag('div');
// Include course AJAX
if (include_course_ajax($course, $modnamesused)) {
    // Add the module chooser
    $renderer = $PAGE->get_renderer('core', 'course');
    echo $renderer->course_modchooser(get_module_metadata($course, $modnames), $course);
}
echo $OUTPUT->footer();

/**
 * Prints the menus to add activities and resources.
 */
function print_section_add_menus($course, $section, $modnames, $vertical = false, $return = false)
{
    global $CFG, $OUTPUT;
    // check to see if user can add menus
    if (!has_capability('moodle/course:manageactivities', get_context_instance(CONTEXT_COURSE, $course->id))) {
        return false;
    }
    // Retrieve all modules with associated metadata
    $modules = get_module_metadata($course, $modnames);
    // We'll sort resources and activities into two lists
    $resources = array();
    $activities = array();
    // We need to add the section section to the link for each module
    $sectionlink = '&section=' . $section;
    foreach ($modules as $module) {
        if (isset($module->types)) {
            // This module has a subtype
            // NOTE: this is legacy stuff, module subtypes are very strongly discouraged!!
            $subtypes = array();
            foreach ($module->types as $subtype) {
                $subtypes[$subtype->link . $sectionlink] = $subtype->title;
            }
            // Sort module subtypes into the list
            if (!empty($module->title)) {
                // This grouping has a name
                if ($module->archetype == MOD_CLASS_RESOURCE) {
                    $resources[] = array($module->title => $subtypes);
                } else {
                    $activities[] = array($module->title => $subtypes);
                }
            } else {
                // This grouping does not have a name
                if ($module->archetype == MOD_CLASS_RESOURCE) {
                    $resources = array_merge($resources, $subtypes);
                } else {
                    $activities = array_merge($activities, $subtypes);
                }
            }
        } else {
            // This module has no subtypes
            if ($module->archetype == MOD_ARCHETYPE_RESOURCE) {
                $resources[$module->link . $sectionlink] = $module->title;
            } else {
                if ($module->archetype === MOD_ARCHETYPE_SYSTEM) {
                    // System modules cannot be added by user, do not add to dropdown
                } else {
                    $activities[$module->link . $sectionlink] = $module->title;
                }
            }
        }
    }
    $straddactivity = get_string('addactivity');
    $straddresource = get_string('addresource');
    $output = '<div class="section_add_menus">';
    if (!$vertical) {
        $output .= '<div class="horizontal">';
    }
    if (!empty($resources)) {
        $select = new url_select($resources, '', array('' => $straddresource), "ressection{$section}");
        $select->set_help_icon('resources');
        $output .= $OUTPUT->render($select);
    }
    if (!empty($activities)) {
        $select = new url_select($activities, '', array('' => $straddactivity), "section{$section}");
        $select->set_help_icon('activities');
        $output .= $OUTPUT->render($select);
    }
    if (!$vertical) {
        $output .= '</div>';
    }
    $output .= '</div>';
    if ($return) {
        return $output;
    } else {
        echo $output;
    }
}

                     " class=\"iconsmall\" alt=\"$streditsummary\" /></a><br /><br />";
            }

            print_section($SITE, $section, $mods, $modnamesused, true);

            if ($editing) {
                print_section_add_menus($SITE, $section->section, $modnames);
            }
            echo $OUTPUT->box_end();
        }
    }
    // Include course AJAX
    if (include_course_ajax($SITE, $modnamesused)) {
        // Add the module chooser
        $renderer = $PAGE->get_renderer('core', 'course');
        echo $renderer->course_modchooser(get_module_metadata($SITE, $modnames), $SITE);
    }

    if (isloggedin() and !isguestuser() and isset($CFG->frontpageloggedin)) {
        $frontpagelayout = $CFG->frontpageloggedin;
    } else {
        $frontpagelayout = $CFG->frontpage;
    }

    foreach (explode(',',$frontpagelayout) as $v) {
        switch ($v) {     /// Display the main part of the front page.
            case FRONTPAGENEWS:
                if ($SITE->newsitems) { // Print forums only when needed
                    require_once($CFG->dirroot .'/mod/forum/lib.php');

                    if (! $newsforum = forum_get_course_forum($SITE->id, 'news')) {

 /**
  * Renders HTML for the menus to add activities and resources to the current course
  *
  * Note, if theme overwrites this function and it does not use modchooser,
  * see also {@link core_course_renderer::add_modchoosertoggle()}
  *
  * @param stdClass $course
  * @param int $section relative section number (field course_sections.section)
  * @param int $sectionreturn The section to link back to
  * @param array $displayoptions additional display options, for example blocks add
  *     option 'inblock' => true, suggesting to display controls vertically
  * @return string
  */
 function course_section_add_cm_control($course, $section, $sectionreturn = null, $displayoptions = array())
 {
     global $CFG;
     $vertical = !empty($displayoptions['inblock']);
     // check to see if user can add menus and there are modules to add
     if (!has_capability('moodle/course:manageactivities', context_course::instance($course->id)) || !$this->page->user_is_editing() || !($modnames = get_module_types_names()) || empty($modnames)) {
         return '';
     }
     // Retrieve all modules with associated metadata
     $modules = get_module_metadata($course, $modnames, $sectionreturn);
     $urlparams = array('section' => $section);
     // We'll sort resources and activities into two lists
     $activities = array(MOD_CLASS_ACTIVITY => array(), MOD_CLASS_RESOURCE => array());
     foreach ($modules as $module) {
         if (isset($module->types)) {
             // This module has a subtype
             // NOTE: this is legacy stuff, module subtypes are very strongly discouraged!!
             $subtypes = array();
             foreach ($module->types as $subtype) {
                 $link = $subtype->link->out(true, $urlparams);
                 $subtypes[$link] = $subtype->title;
             }
             // Sort module subtypes into the list
             $activityclass = MOD_CLASS_ACTIVITY;
             if ($module->archetype == MOD_CLASS_RESOURCE) {
                 $activityclass = MOD_CLASS_RESOURCE;
             }
             if (!empty($module->title)) {
                 // This grouping has a name
                 $activities[$activityclass][] = array($module->title => $subtypes);
             } else {
                 // This grouping does not have a name
                 $activities[$activityclass] = array_merge($activities[$activityclass], $subtypes);
             }
         } else {
             // This module has no subtypes
             $activityclass = MOD_CLASS_ACTIVITY;
             if ($module->archetype == MOD_ARCHETYPE_RESOURCE) {
                 $activityclass = MOD_CLASS_RESOURCE;
             } else {
                 if ($module->archetype === MOD_ARCHETYPE_SYSTEM) {
                     // System modules cannot be added by user, do not add to dropdown
                     continue;
                 }
             }
             $link = $module->link->out(true, $urlparams);
             $activities[$activityclass][$link] = $module->title;
         }
     }
     $straddactivity = get_string('addactivity');
     $straddresource = get_string('addresource');
     $sectionname = get_section_name($course, $section);
     $strresourcelabel = get_string('addresourcetosection', null, $sectionname);
     $stractivitylabel = get_string('addactivitytosection', null, $sectionname);
     $output = html_writer::start_tag('div', array('class' => 'section_add_menus', 'id' => 'add_menus-section-' . $section));
     if (!$vertical) {
         $output .= html_writer::start_tag('div', array('class' => 'horizontal'));
     }
     if (!empty($activities[MOD_CLASS_RESOURCE])) {
         $select = new url_select($activities[MOD_CLASS_RESOURCE], '', array('' => $straddresource), "ressection{$section}");
         $select->set_help_icon('resources');
         $select->set_label($strresourcelabel, array('class' => 'accesshide'));
         $output .= $this->output->render($select);
     }
     if (!empty($activities[MOD_CLASS_ACTIVITY])) {
         $select = new url_select($activities[MOD_CLASS_ACTIVITY], '', array('' => $straddactivity), "section{$section}");
         $select->set_help_icon('activities');
         $select->set_label($stractivitylabel, array('class' => 'accesshide'));
         $output .= $this->output->render($select);
     }
     if (!$vertical) {
         $output .= html_writer::end_tag('div');
     }
     $output .= html_writer::end_tag('div');
     if (course_ajax_enabled($course) && $course->id == $this->page->course->id) {
         // modchooser can be added only for the current course set on the page!
         $straddeither = get_string('addresourceoractivity');
         // The module chooser link
         $modchooser = html_writer::start_tag('div', array('class' => 'mdl-right'));
         $modchooser .= html_writer::start_tag('div', array('class' => 'section-modchooser'));
         $icon = $this->output->pix_icon('t/add', '');
         $span = html_writer::tag('span', $straddeither, array('class' => 'section-modchooser-text'));
         $modchooser .= html_writer::tag('span', $icon . $span, array('class' => 'section-modchooser-link'));
         $modchooser .= html_writer::end_tag('div');
         $modchooser .= html_writer::end_tag('div');
         // Wrap the normal output in a noscript div
         $usemodchooser = get_user_preferences('usemodchooser', $CFG->modchooserdefault);
//.........这里部分代码省略.........

        $section->section = 0;
        $section->visible = 1;
        $section->summaryformat = FORMAT_HTML;
        $section->id = $DB->insert_record('course_sections', $section);
        rebuild_course_cache($course->id);
        $modinfo = get_fast_modinfo($COURSE);
        if (!$sections = $modinfo->get_section_info_all()) {      // Try again
            print_error('cannotcreateorfindstructs', 'error');
        }
    }

    // CAUTION, hacky fundamental variable defintion to follow!
    // Note that because of the way course fromats are constructed though
    // inclusion we pass parameters around this way..
    $displaysection = $section;

    // Include the actual course format.
    require($CFG->dirroot .'/course/format/'. $course->format .'/format.php');
    // Content wrapper end.

    echo html_writer::end_tag('div');

    // Include course AJAX
    if (include_course_ajax($course, $modnamesused)) {
        // Add the module chooser
        $renderer = $PAGE->get_renderer('core', 'course');
        echo $renderer->course_modchooser(get_module_metadata($course, $modnames, $displaysection), $course);
    }

    echo $OUTPUT->footer();

/**
 * Prints the menus to add activities and resources.
 */
function print_section_add_menus($course, $section, $modnames, $vertical = false, $return = false)
{
    global $CFG, $OUTPUT;
    // check to see if user can add menus
    if (!has_capability('moodle/course:manageactivities', get_context_instance(CONTEXT_COURSE, $course->id))) {
        return false;
    }
    // Retrieve all modules with associated metadata
    $modules = get_module_metadata($course, $modnames);
    // We'll sort resources and activities into two lists
    $resources = array();
    $activities = array();
    // We need to add the section section to the link for each module
    $sectionlink = '&section=' . $section;
    foreach ($modules as $module) {
        if (isset($module->types)) {
            // This module has a subtype
            // NOTE: this is legacy stuff, module subtypes are very strongly discouraged!!
            $subtypes = array();
            foreach ($module->types as $subtype) {
                $subtypes[$subtype->link . $sectionlink] = $subtype->title;
            }
            // Sort module subtypes into the list
            if (!empty($module->title)) {
                // This grouping has a name
                if ($module->archetype == MOD_CLASS_RESOURCE) {
                    $resources[] = array($module->title => $subtypes);
                } else {
                    $activities[] = array($module->title => $subtypes);
                }
            } else {
                // This grouping does not have a name
                if ($module->archetype == MOD_CLASS_RESOURCE) {
                    $resources = array_merge($resources, $subtypes);
                } else {
                    $activities = array_merge($activities, $subtypes);
                }
            }
        } else {
            // This module has no subtypes
            if ($module->archetype == MOD_ARCHETYPE_RESOURCE) {
                $resources[$module->link . $sectionlink] = $module->title;
            } else {
                if ($module->archetype === MOD_ARCHETYPE_SYSTEM) {
                    // System modules cannot be added by user, do not add to dropdown
                } else {
                    $activities[$module->link . $sectionlink] = $module->title;
                }
            }
        }
    }
    $straddactivity = get_string('addactivity');
    $straddresource = get_string('addresource');
    $output = html_writer::start_tag('div', array('class' => 'section_add_menus', 'id' => 'add_menus-section-' . $section));
    if (!$vertical) {
        $output .= html_writer::start_tag('div', array('class' => 'horizontal'));
    }
    if (!empty($resources)) {
        $select = new url_select($resources, '', array('' => $straddresource), "ressection{$section}");
        $select->set_help_icon('resources');
        $output .= $OUTPUT->render($select);
    }
    if (!empty($activities)) {
        $select = new url_select($activities, '', array('' => $straddactivity), "section{$section}");
        $select->set_help_icon('activities');
        $output .= $OUTPUT->render($select);
    }
    if (!$vertical) {
        $output .= html_writer::end_tag('div');
    }
    $output .= html_writer::end_tag('div');
    if (course_ajax_enabled($course)) {
        $straddeither = get_string('addresourceoractivity');
        // The module chooser link
        $modchooser = html_writer::start_tag('div', array('class' => 'mdl-right'));
        $modchooser .= html_writer::start_tag('div', array('class' => 'section-modchooser'));
        $icon = $OUTPUT->pix_icon('t/add', $straddeither);
        $span = html_writer::tag('span', $straddeither, array('class' => 'section-modchooser-text'));
        $modchooser .= html_writer::link('#', $icon . $span, array('class' => 'section-modchooser-link'));
        $modchooser .= html_writer::end_tag('div');
        $modchooser .= html_writer::end_tag('div');
        // Wrap the normal output in a noscript div
        $usemodchooser = get_user_preferences('usemodchooser', 1);
        if ($usemodchooser) {
            $output = html_writer::tag('div', $output, array('class' => 'hiddenifjs addresourcedropdown'));
            $modchooser = html_writer::tag('div', $modchooser, array('class' => 'visibleifjs addresourcemodchooser'));
        } else {
            $output = html_writer::tag('div', $output, array('class' => 'visibleifjs addresourcedropdown'));
            $modchooser = html_writer::tag('div', $modchooser, array('class' => 'hiddenifjs addresourcemodchooser'));
        }
        $output = $modchooser . $output;
    }
    if ($return) {
        return $output;
    } else {
        echo $output;
    }
//.........这里部分代码省略.........

 /**
  * Renders HTML for the menus to add activities and resources to the current course
  *
  * Note, if theme overwrites this function and it does not use modchooser,
  * see also {@link core_course_renderer::add_modchoosertoggle()}
  *
  * @param stdClass $course
  * @param int $section relative section number (field course_sections.section)
  * @param int $sectionreturn The section to link back to
  * @param array $displayoptions additional display options, for example blocks add
  *     option 'inblock' => true, suggesting to display controls vertically
  * @return string
  */
 public function course_section_add_cm_control($course, $section, $sectionreturn = null, $displayoptions = array())
 {
     // Check to see if user can add menus and there are modules to add.
     if (!has_capability('moodle/course:manageactivities', context_course::instance($course->id)) || !($modnames = get_module_types_names()) || empty($modnames)) {
         return '';
     }
     // Retrieve all modules with associated metadata.
     $modules = get_module_metadata($course, $modnames, $sectionreturn);
     $urlparams = array('section' => $section);
     // S Lamour Aug 2015 - show activity picker
     // moodle is adding a link around the span in a span with js - yay!! go moodle...
     $modchooser = "<div class='snap-modchooser btn btn-default section_add_menus'>\n              <span class='section-modchooser-link'><span>" . get_string('addresourceoractivity', 'theme_snap') . "</span></span>\n            </div>";
     $output = $this->courserenderer->course_modchooser($modules, $course) . $modchooser;
     // Add zone for quick uploading of files.
     $upload = '<form class="snap-dropzone">
           <label for="snap-drop-file-' . $section . '" class="snap-dropzone-label h6">' . get_string('dropzonelabel', 'theme_snap') . '</label>
           <input type="file" multiple name="snap-drop-file-' . $section . '" id="snap-drop-file-' . $section . '" class="js-snap-drop-file sr-only"/>
           </form>';
     return $output . $upload;
 }

 /**
  * Checks if the activity type has multiple items in the activity chooser.
  * This may happen as a result of defining callback modulename_get_shortcuts()
  * or [deprecated] modulename_get_types() - TODO MDL-53697 remove this line.
  *
  * @return bool|null (null if the check is not possible)
  */
 public function activity_has_subtypes()
 {
     if (!($modname = $this->get_activitytype())) {
         return null;
     }
     $metadata = get_module_metadata($this->get_course(), self::get_supported_activities());
     foreach ($metadata as $key => $moduledata) {
         if (preg_match('/^' . $modname . ':/', $key)) {
             return true;
         }
     }
     return false;
 }