Added a simple system for treeViews.

src/Controller/TreeBuilder.php

@@ -0,0 +1,104 @@
+<?php
+/**
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/.
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * 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
+ */
+
+namespace App\Controller;
+
+use App\Entity\StructuralDBElement;
+use App\Helpers\TreeViewNode;
+use App\Repository\StructuralDBElementRepository;
+use App\Services\EntityURLGenerator;
+use App\Services\ToolsTreeBuilder;
+use Doctrine\ORM\EntityManagerInterface;
+
+/**
+ *  This service gives you multiple possibilities to generate trees.
+ *
+ * @package App\Controller
+ */
+class TreeBuilder
+{
+    protected $url_generator;
+    protected $em;
+
+    public function __construct(EntityURLGenerator $URLGenerator, EntityManagerInterface $em)
+    {
+        $this->url_generator = $URLGenerator;
+        $this->em = $em;
+    }
+
+    /**
+     * Generates a tree for the given Element. The given element is the top node, all children are child nodes.
+     * @param StructuralDBElement $element The element for which the tree should be generated.
+     * @param string $href_type The type of the links that should be used for the links. Set to null, to disable links.
+     *                          See EntityURLGenerator::getURL for possible types.
+     * @return TreeViewNode The Node for the given Element.
+     */
+    public function elementToTreeNode(StructuralDBElement $element, string $href_type = 'list_parts') : TreeViewNode
+    {
+        $children = $element->getSubelements();
+
+        $children_nodes = null;
+        foreach ($children as $child) {
+            $children_nodes[] = $this->elementToTreeNode($child);
+        }
+
+        //Check if we need to generate a href type
+        $href = null;
+
+        if (!empty($href_type)) {
+            $href = $this->url_generator->getURL($element, $href_type);
+        }
+
+        return new TreeViewNode($element->getName(), $href, $children_nodes);
+    }
+
+    /**
+     * Generates a tree for all elements of the given type
+     * @param StructuralDBElement $class_name The class name of the StructuralDBElement class for which the tree should
+     *                                          be generated.
+     * @param string $href_type The type of the links that should be used for the links. Set to null, to disable links.
+     *                          See EntityURLGenerator::getURL for possible types.
+     * @return TreeViewNode[] Returns an array, containing all nodes. It is empty if the given class has no elements.
+     */
+    public function typeToTree(StructuralDBElement $class_name, string $href_type = 'list_parts') : array
+    {
+        /**
+         * @var $repo StructuralDBElementRepository
+         */
+        $repo = $this->em->getRepository($class_name);
+        $root_nodes = $repo->findRootNodes();
+
+        $array = array();
+        foreach ($root_nodes as $node) {
+            $array = $this->elementToTreeNode($node, $href_type);
+        }
+
+        return $array;
+    }
+}