Renderer.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\UI\Implementation\Component\Tree;
 
use ILIAS\UI\Implementation\Render\AbstractComponentRenderer;
use ILIAS\UI\Renderer as RendererInterface;
use ILIAS\UI\Component;
use ILIAS\UI\Component\Tree;
use ILIAS\UI\Implementation\Render\ResourceRegistry;
 
class Renderer extends AbstractComponentRenderer
{
    public function render(Component\Component $component, RendererInterface $default_renderer): string
    {
        if (!$component instanceof Tree\Expandable) {
            $this->cannotHandleComponent($component);
        }
 
        $tpl_name = "tpl.tree.html";
        $tpl = $this->getTemplate($tpl_name, true, true);
 
        $tpl->setVariable("ARIA_LABEL", $component->getLabel());
 
        $nodes = [];
        foreach ($component->getData() as $record) {
            $nodes[] = $this->buildNode(
                $component->getRecursion(),
                $record,
                $component->getEnvironment()
            );
        }
 
        $nodes_html = $default_renderer->render($nodes);
 
        if ($component->isSubTree()) {
            return $nodes_html;
        }
 
        $tpl->setVariable('NODES', $nodes_html);
 
        $highlight_node_on_click = $component->getHighlightOnNodeClick();
        $component = $component->withAdditionalOnLoadCode(
            fn($id) => "il.UI.tree.init('$id', $highlight_node_on_click)"
        );
 
        $id = $this->bindJavaScript($component);
        $tpl->setVariable("ID", $id);
 
 
        return $tpl->get();
    }
 
    protected function buildNode(
        Tree\TreeRecursion $recursion,
        $record,
        $environment
    ): Tree\Node\Node {
        $node = $recursion->build(
            $this->getUIFactory()->tree()->node(),
            $record,
            $environment
        );
 
        foreach ($recursion->getChildren($record, $environment) as $sub_record) {
            $node = $node->withAdditionalSubnode(
                $this->buildNode($recursion, $sub_record, $environment)
            );
        }
 
        return $node;
    }
 
    public function registerResources(ResourceRegistry $registry): void
    {
        parent::registerResources($registry);
        $registry->register('assets/js/tree.js');
    }
}