DataLoader.php

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<?php
namespace Magento\Theme\Model\Design\Config\DataProvider;

use Magento\Framework\App\Request\DataPersistorInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Theme\Api\DesignConfigRepositoryInterface;

class DataLoader
{
    protected $request;

    protected $designConfigRepository;

    protected $dataPersistor;

    public function __construct(
        RequestInterface $request,
        DesignConfigRepositoryInterface $designConfigRepository,
        DataPersistorInterface $dataPersistor
    ) {
        $this->request = $request;
        $this->designConfigRepository = $designConfigRepository;
        $this->dataPersistor = $dataPersistor;
    }

    public function getData()
    {
        $scope = $this->request->getParam('scope');
        $scopeId = $this->request->getParam('scope_id');

        $data = $this->loadData($scope, $scopeId);

        $data[$scope]['scope'] = $scope;
        $data[$scope]['scope_id'] = $scopeId;

        return $data;
    }

    protected function loadData($scope, $scopeId)
    {
        $designConfig = $this->designConfigRepository->getByScope($scope, $scopeId);
        $fieldsData = $designConfig->getExtensionAttributes()->getDesignConfigData();
        $data = [];
        foreach ($fieldsData as $fieldData) {
            $data[$scope][$fieldData->getFieldConfig()['field']] = $fieldData->getValue();
        }

        $storedData = $this->dataPersistor->get('theme_design_config');
        if (isset($storedData['scope']) && isset($storedData['scope_id'])
            && $storedData['scope'] == $scope && $storedData['scope_id'] == $scopeId
        ) {
            $data[$scope] = $storedData;
            $this->dataPersistor->clear('theme_design_config');
        }

        return $data;
    }
}