Tree.php

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<?php
namespace Magento\Theme\Block\Adminhtml\Wysiwyg\Files;

class Tree extends \Magento\Backend\Block\Template
{
    protected $_storageHelper;

    protected $urlEncoder;

    private $serializer;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Theme\Helper\Storage $storageHelper,
        \Magento\Framework\Url\EncoderInterface $urlEncoder,
        array $data = [],
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        $this->_storageHelper = $storageHelper;
        $this->urlEncoder = $urlEncoder;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
        parent::__construct($context, $data);
    }

    public function getTreeLoaderUrl()
    {
        return $this->getUrl('adminhtml/*/treeJson', $this->_storageHelper->getRequestParams());
    }

    public function getTreeJson($data)
    {
        return $this->serializer->serialize($data);
    }

    public function getRootNodeName()
    {
        return __('Storage Root');
    }

    public function getTreeCurrentPath()
    {
        $treePath = '/root';
        $path = $this->_storageHelper->getSession()->getCurrentPath();
        if ($path) {
            $path = str_replace($this->_storageHelper->getStorageRoot(), '', $path);
            $relative = '';
            foreach (explode('/', $path) as $dirName) {
                if ($dirName) {
                    $relative .= '/' . $dirName;
                    $treePath .= '/' . $this->urlEncoder->encode($relative);
                }
            }
        }
        return $treePath;
    }
}