mediawiki-extensions-CategoryTree/includes/CategoryTreeCategoryViewer.php

<?php
/**
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

class CategoryTreeCategoryViewer extends CategoryViewer {
	public $child_cats;

	/**
	 * @var CategoryTree
	 */
	public $categorytree;

	/**
	 * @return 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;
	}

	/**
	 * Add a subcategory to the internal lists
	 * @param Category $cat
	 * @param string $sortkey
	 * @param int $pageLength
	 */
	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();
	}
}