AssignProducts.php

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

class AssignProducts extends \Magento\Backend\Block\Template
{
    protected $_template = 'Magento_Catalog::catalog/category/edit/assign_products.phtml';

    protected $blockGrid;

    protected $registry;

    protected $jsonEncoder;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Json\EncoderInterface $jsonEncoder,
        array $data = []
    ) {
        $this->registry = $registry;
        $this->jsonEncoder = $jsonEncoder;
        parent::__construct($context, $data);
    }

    public function getBlockGrid()
    {
        if (null === $this->blockGrid) {
            $this->blockGrid = $this->getLayout()->createBlock(
                \Magento\Catalog\Block\Adminhtml\Category\Tab\Product::class,
                'category.product.grid'
            );
        }
        return $this->blockGrid;
    }

    public function getGridHtml()
    {
        return $this->getBlockGrid()->toHtml();
    }

    public function getProductsJson()
    {
        $products = $this->getCategory()->getProductsPosition();
        if (!empty($products)) {
            return $this->jsonEncoder->encode($products);
        }
        return '{}';
    }

    public function getCategory()
    {
        return $this->registry->registry('category');
    }
}