PriceBox.php

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<?php
namespace Magento\Catalog\Pricing\Render;

use Magento\Catalog\Model\Product;
use Magento\Framework\Json\Helper\Data;
use Magento\Framework\Math\Random;
use Magento\Framework\Pricing\Price\PriceInterface;
use Magento\Framework\Pricing\Render\PriceBox as PriceBoxRender;
use Magento\Framework\Pricing\Render\RendererPool;
use Magento\Framework\View\Element\Template\Context;

class PriceBox extends PriceBoxRender
{
    protected $jsonHelper;

    protected $mathRandom;

    public function __construct(
        Context $context,
        Product $saleableItem,
        PriceInterface $price,
        RendererPool $rendererPool,
        Data $jsonHelper,
        Random $mathRandom,
        array $data = []
    ) {
        $this->jsonHelper = $jsonHelper;
        $this->mathRandom = $mathRandom;
        parent::__construct($context, $saleableItem, $price, $rendererPool);
    }

    public function jsonEncode($valueToEncode)
    {
        return $this->jsonHelper->jsonEncode($valueToEncode);
    }

    public function getRandomString($length, $chars = null)
    {
        return $this->mathRandom->getRandomString($length, $chars);
    }

    public function getCanDisplayQty(Product $product)
    {
        //TODO Refactor - change to const similar to Model\Product\Type\Grouped::TYPE_CODE
        if ($product->getTypeId() == 'grouped') {
            return false;
        }
        return true;
    }
}