Navigation.php

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<?php
namespace Magento\LayeredNavigation\Block;

use Magento\Framework\View\Element\Template;

class Navigation extends \Magento\Framework\View\Element\Template
{
    protected $_catalogLayer;

    protected $filterList;

    protected $visibilityFlag;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Catalog\Model\Layer\Resolver $layerResolver,
        \Magento\Catalog\Model\Layer\FilterList $filterList,
        \Magento\Catalog\Model\Layer\AvailabilityFlagInterface $visibilityFlag,
        array $data = []
    ) {
        $this->_catalogLayer = $layerResolver->get();
        $this->filterList = $filterList;
        $this->visibilityFlag = $visibilityFlag;
        parent::__construct($context, $data);
    }

    protected function _prepareLayout()
    {
        foreach ($this->filterList->getFilters($this->_catalogLayer) as $filter) {
            $filter->apply($this->getRequest());
        }
        $this->getLayer()->apply();
        return parent::_prepareLayout();
    }

    public function getLayer()
    {
        return $this->_catalogLayer;
    }

    public function getStateHtml()
    {
        return $this->getChildHtml('state');
    }

    public function getFilters()
    {
        return $this->filterList->getFilters($this->_catalogLayer);
    }

    public function canShowBlock()
    {
        return $this->visibilityFlag->isEnabled($this->getLayer(), $this->getFilters());
    }

    public function getClearUrl()
    {
        return $this->getChildBlock('state')->getClearUrl();
    }
}