class.ilTreeExplorerGUI.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

include_once("./Services/UIComponent/Explorer2/classes/class.ilExplorerBaseGUI.php");

abstract class ilTreeExplorerGUI extends ilExplorerBaseGUI
{
        protected $tree = null;
        protected $order_field = "";
        protected $order_field_numeric = false;
        protected $type_white_list = array();
        protected $type_black_list = array();
        protected $childs = array();                    // preloaded childs
        protected $preloaded = false;
        protected $preload_childs = false;
        protected $root_node_data = null;
        protected $all_childs = array();
        
        public function __construct($a_expl_id, $a_parent_obj, $a_parent_cmd, $a_tree)
        {
                parent::__construct($a_expl_id, $a_parent_obj, $a_parent_cmd);
                $this->tree = $a_tree;
        }
        
        function getTree()
        {
                return $this->tree;
        }
        
        function setOrderField($a_val, $a_numeric = false)
        {
                $this->order_field = $a_val;
                $this->order_field_numeric = $a_numeric;
        }
        
        function getOrderField()
        {
                return $this->order_field;
        }
        
        function setTypeWhiteList($a_val)
        {
                $this->type_white_list = $a_val;
        }
        
        function getTypeWhiteList()
        {
                return $this->type_white_list;
        }
        
        function setTypeBlackList($a_val)
        {
                $this->type_black_list = $a_val;
        }
        
        function getTypeBlackList()
        {
                return $this->type_black_list;
        }

        function setPreloadChilds($a_val)
        {
                $this->preload_childs = $a_val;
        }

        function getPreloadChilds()
        {
                return $this->preload_childs;
        }

        protected function preloadChilds()
        {
                $subtree = $this->tree->getSubTree($this->getRootNode());
                foreach ($subtree as $s)
                {
                        $wl = $this->getTypeWhiteList();
                        if (is_array($wl) && count($wl) > 0 && !in_array($s["type"], $wl))
                        {
                                continue;
                        }
                        $bl = $this->getTypeBlackList();
                        if (is_array($bl) && count($bl) > 0 && in_array($s["type"], $bl))
                        {
                                continue;
                        }
                        $this->childs[$s["parent"]][] = $s;
                        $this->all_childs[$s["child"]] = $s;
                }

                if ($this->order_field != "")
                {
                        foreach ($this->childs as $k => $childs)
                        {
                                $this->childs[$k] = ilUtil::sortArray($childs, $this->order_field, "asc", $this->order_field_numeric);
                        }
                }

                // sort childs and store prev/next reference
                if ($this->order_field == "")
                {
                        $this->all_childs =
                                ilUtil::sortArray($this->all_childs, "lft", "asc", true, true);
                        $prev = false;
                        foreach ($this->all_childs as $k => $c)
                        {
                                if ($prev)
                                {
                                        $this->all_childs[$prev]["next_node_id"] = $k;
                                }
                                $this->all_childs[$k]["prev_node_id"] = $prev;
                                $this->all_childs[$k]["next_node_id"] = false;
                                $prev = $k;
                        }
                }

                $this->preloaded = true;
        }



        function getSuccessorNode($a_node_id, $a_type = "")
        {
                if ($this->order_field != "")
                {
                        die("ilTreeExplorerGUI::getSuccessorNode not implemented for order field ".$this->order_field);
                }

                if ($this->preloaded)
                {
                        $next_id = $a_node_id;
                        while (($next_id = $this->all_childs[$next_id]["next_node_id"]) && $a_type != "" &&
                                $this->all_childs[$next_id]["type"] != $a_type);
                        if ($next_id)
                        {
                                return $this->all_childs[$next_id];
                        }
                        return false;
                }
                return $this->getTree()->fetchSuccessorNode($a_node_id, $a_type);
        }



        function getChildsOfNode($a_parent_node_id)
        {
                if ($this->preloaded)
                {
                        if (is_array($this->childs[$a_parent_node_id]))
                        {
                                return $this->childs[$a_parent_node_id];
                        }
                        return array();
                }

                $wl = $this->getTypeWhiteList();
                if (is_array($wl) && count($wl) > 0)
                {
                        $childs = $this->tree->getChildsByTypeFilter($a_parent_node_id, $wl, $this->getOrderField());
                }
                else
                {
                        $childs = $this->tree->getChilds($a_parent_node_id, $this->getOrderField());
                }
                
                // apply black list filter
                $bl = $this->getTypeBlackList();
                if (is_array($bl) && count($bl) > 0)
                {
                        $bl_childs = array();
                        foreach($childs as $k => $c)
                        {
                                if (!in_array($c["type"], $bl))
                                {
                                        $bl_childs[$k] = $c;
                                }
                        }
                        return $bl_childs; 
                }
                
                return $childs;
        }
        
        function getNodeId($a_node)
        {
                return $a_node["child"];
        }

        function getNodeIconAlt($a_node)
        {
                global $lng;
                
                return $lng->txt("icon")." ".$lng->txt("obj_".$a_node["type"]);
        }

        function getRootNode()
        {
                if (isset($this->root_node_data))
                {
                        return $this->root_node_data;
                }
                $root_id = $this->getTree()->readRootId();
                $this->root_node_data =  $this->getTree()->getNodeData($root_id);
                return $this->root_node_data;
        }
        
        function setPathOpen($a_id)
        {
                $path = $this->getTree()->getPathId($a_id);
                foreach ($path as $id)
                {
                        $this->setNodeOpen($id);
                }
        }

        function getHTML()
        {
                if ($this->getPreloadChilds())
                {
                        $this->preloadChilds();
                }
                return parent::getHTML();
        }


}

?>