Drilldown.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\UI\Implementation\Component\Menu;
 
use ILIAS\UI\Component\Menu as IMenu;
use ILIAS\UI\Implementation\Component\JavaScriptBindable;
use ILIAS\UI\Implementation\Component\SignalGeneratorInterface;
use ILIAS\UI\Component\Signal;
 
class Drilldown extends Menu implements IMenu\Drilldown
{
    use JavaScriptBindable;
 
    protected Signal $signal;
    protected ?string $persistence_id = null;
 
    public function __construct(
        SignalGeneratorInterface $signal_generator,
        string $label,
        array $items
    ) {
        $this->checkItemParameter($items);
        $this->label = $label;
        $this->items = $items;
        $this->signal = $signal_generator->create();
    }
 
    public function getBacklinkSignal(): Signal
    {
        return $this->signal;
    }
 
    public function withPersistenceId(?string $id): self
    {
        if (is_null($id)) {
            return $this;
        }
        $clone = clone $this;
        $clone->persistence_id = $id;
        return $clone;
    }
 
    public function getPersistenceId(): ?string
    {
        return $this->persistence_id;
    }
}