class.ilLSTOCGUI.php

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<?php

declare(strict_types=1);

class ilLSTOCGUI extends ilExplorerBaseGUI
{
    protected $id = 'ls_toc';
    protected $structure;
    protected $nodes = [];
    protected $url_builder;

    public function __construct(
        LSUrlBuilder $url_builder,
        ilCtrl $il_ctrl
    ) {
        $this->url_builder = $url_builder;
        $this->ctrl = $il_ctrl; //ilExplorerBaseGUI needs ctrl...
        $this->setSkipRootNode(false);
        $this->setNodeOnclickEnabled(true);
    }

    public function withStructure(string $json_structure)
    {
        $clone = clone $this;
        $clone->structure = $clone->addIds(
            json_decode($json_structure, true)
        );
        $clone->buildLookup($clone->structure); //sets $this->nodes
        $clone->open_nodes = array_keys($clone->nodes); //all open
        return $clone;
    }

    protected $counter = 0;
    protected function addIds(array $node) : array
    {
        $node['_id'] = $this->counter;
        $this->counter++;
        if (array_key_exists('childs', $node)) {
            foreach ($node['childs'] as $idx => $child) {
                $node['childs'][$idx] = $this->addIds($child);
            }
        }
        return $node;
    }

    protected function buildLookup(array $node)
    {
        $this->nodes[$node['_id']] = $node;
        if (array_key_exists('childs', $node)) {
            foreach ($node['childs'] as $child) {
                $this->buildLookup($child);
            }
        }
    }

    public function getRootNode()
    {
        return reset($this->nodes);
    }

    public function getChildsOfNode($a_parent_node_id)
    {
        $parent_node = $this->nodes[$a_parent_node_id];
        return $parent_node['childs'];
    }

    public function getNodeContent($a_node)
    {
        return $a_node['label'];
    }

    public function getNodeId($a_node)
    {
        return $a_node['_id'];
    }

    public function getNodeHref($a_node)
    {
        return $this->url_builder->getHref($a_node['command'], $a_node['parameter']);
    }

    public function isNodeClickable($a_node)
    {
        return !is_null($a_node['parameter']);
    }
}