Section.php

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<?php

declare(strict_types=1);

namespace ILIAS\UI\Implementation\Component\Input\Field;

use ILIAS\Data\Factory as DataFactory;
use ILIAS\Language\Language;
use ILIAS\UI\Component as C;

class Section extends Group implements C\Input\Field\Section
{
    protected int $nesting_level = 0;

    public function __construct(
        DataFactory $data_factory,
        \ILIAS\Refinery\Factory $refinery,
        Language $lng,
        array $inputs,
        string $label,
        ?string $byline = null
    ) {
        parent::__construct($data_factory, $refinery, $lng, $inputs, $label, $byline);
        $this->updateChildrenNestingLevels();
    }

    public function setNestingLevel(int $nesting_level): void
    {
        $this->nesting_level = $nesting_level;
        $this->updateChildrenNestingLevels();
    }

    public function getNestingLevel(): int
    {
        return $this->nesting_level;
    }

    protected function setInputs(array $inputs): void
    {
        parent::setInputs($inputs);
        $this->updateChildrenNestingLevels();
    }

    private function updateChildrenNestingLevels(): void
    {
        foreach ($this->getInputs() as $input) {
            if ($input instanceof Section) {
                $nesting_level = $this->getNestingLevel() + 1;
                $input->setNestingLevel($nesting_level);
            }
        }
    }
}