GoogleoptimizerForm.php

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<?php
namespace Magento\GoogleOptimizer\Block\Adminhtml\Catalog\Category\Edit;

class GoogleoptimizerForm extends \Magento\Catalog\Block\Adminhtml\Form
{
    protected $_registry;

    protected $_codeHelper;

    protected $_formHelper;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Data\FormFactory $formFactory,
        \Magento\GoogleOptimizer\Helper\Code $codeHelper,
        \Magento\GoogleOptimizer\Helper\Form $formHelper,
        array $data = []
    ) {
        parent::__construct($context, $registry, $formFactory, $data);

        $this->_codeHelper = $codeHelper;
        $this->_formHelper = $formHelper;
        $this->setForm($formFactory->create());
    }

    protected function _prepareForm()
    {
        $this->_formHelper->addGoogleoptimizerFields($this->getForm(), $this->_getGoogleExperiment(), 'category_form');
        $this->getForm()->getElement('googleoptimizer_fields')->setData(['legend' => null]);
        return parent::_prepareForm();
    }

    protected function _getGoogleExperiment()
    {
        $category = $this->_getCategory();
        if ($category->getId()) {
            return $this->_codeHelper->getCodeObjectByEntity($category);
        }
        return null;
    }

    protected function _getCategory()
    {
        $entity = $this->_coreRegistry->registry('current_category');
        if (!$entity) {
            throw new \RuntimeException('Entity is not found in registry.');
        }
        return $entity;
    }
}