expandable2.php

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<?php

declare(strict_types=1);

namespace ILIAS\UI\examples\Tree\Expandable;

function expandable2(): string
{
    global $DIC;
    $f = $DIC->ui()->factory();
    $renderer = $DIC->ui()->renderer();

    $getDataNode = function (string $label, array $children = []) {
        return new class ($label, $children) {
            protected string $label = '';
            protected array $children = [];

            public function __construct(string $label, array $children = [])
            {
                $this->label = $label;
                $this->children = $children;
            }

            public function getLabel(): string
            {
                return $this->label;
            }

            public function getChildren(): array
            {
                return $this->children;
            }
        };
    };

    $n11 = $getDataNode('1.1');
    $n12 = $getDataNode('1.2', [$getDataNode('1.2.1')]);
    $n1 = $getDataNode('1', [$n11, $n12]);
    $data = [$n1];

    $recursion = new class () implements \ILIAS\UI\Component\Tree\TreeRecursion {
        public function getChildren($record, $environment = null): array
        {
            return $record->getChildren();
        }

        public function build(
            \ILIAS\UI\Component\Tree\Node\Factory $factory,
            $record,
            $environment = null
        ): \ILIAS\UI\Component\Tree\Node\Node {
            return $factory->simple($record->getLabel());
        }
    };

    $tree = $f->tree()->expandable("Label", $recursion)
        ->withData($data);

    return $renderer->render($tree);
}