CategoryTreeCategoryViewer.php

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<?php
class CategoryTreeCategoryViewer extends CategoryViewer {
    public $child_cats;
 
    public $categorytree;
 
    private function getCategoryTree() {
        global $wgCategoryTreeCategoryPageOptions;
 
        if ( !isset( $this->categorytree ) ) {
            if ( !CategoryTreeHooks::shouldForceHeaders() ) {
                CategoryTree::setHeaders( $this->getOutput() );
            }
 
            $this->categorytree = new CategoryTree( $wgCategoryTreeCategoryPageOptions );
        }
 
        return $this->categorytree;
    }
 
    public function addSubcategoryObject( Category $cat, $sortkey, $pageLength ) {
        $title = $cat->getTitle();
 
        if ( $this->getRequest()->getCheck( 'notree' ) ) {
            parent::addSubcategoryObject( $cat, $sortkey, $pageLength );
            return;
        }
 
        $tree = $this->getCategoryTree();
 
        $this->children[] = $tree->renderNodeInfo( $title, $cat );
 
        $this->children_start_char[] = $this->getSubcategorySortChar( $title, $sortkey );
    }
 
    public function clearCategoryState() {
        $this->child_cats = [];
        parent::clearCategoryState();
    }
 
    public function finaliseCategoryState() {
        if ( $this->flip ) {
            $this->child_cats = array_reverse( $this->child_cats );
        }
        parent::finaliseCategoryState();
    }
}