FooterPagelet example

public function load(Request $request, SalesChannelContext $salesChannelContext): FooterPagelet
    {
        $footerId = $salesChannelContext->getSalesChannel()->getFooterCategoryId();

        $tree = null;
        if ($footerId) {
            $navigationId = $request->get('navigationId', $footerId);

            $tree = $this->navigationLoader->load($navigationId, $salesChannelContext, $footerId);
        }

        $pagelet = new FooterPagelet($tree);

        $this->eventDispatcher->dispatch(
            new FooterPageletLoadedEvent($pagelet, $salesChannelContext, $request)
        );

        return $pagelet;
    }
}