FinalPriceBox.php

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

use Magento\Catalog\Model\Product\Pricing\Renderer\SalableResolverInterface;
use Magento\Catalog\Pricing\Price\FinalPrice;
use Magento\Catalog\Pricing\Price\MinimalPriceCalculatorInterface;
use Magento\Catalog\Pricing\Price\RegularPrice;
use Magento\ConfigurableProduct\Pricing\Price\ConfigurableOptionsProviderInterface;
use Magento\ConfigurableProduct\Pricing\Price\LowestPriceOptionsProviderInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Pricing\Price\PriceInterface;
use Magento\Framework\Pricing\Render\RendererPool;
use Magento\Framework\Pricing\SaleableInterface;
use Magento\Framework\View\Element\Template\Context;

class FinalPriceBox extends \Magento\Catalog\Pricing\Render\FinalPriceBox
{
    private $lowestPriceOptionsProvider;

    public function __construct(
        Context $context,
        SaleableInterface $saleableItem,
        PriceInterface $price,
        RendererPool $rendererPool,
        ConfigurableOptionsProviderInterface $configurableOptionsProvider,
        array $data = [],
        LowestPriceOptionsProviderInterface $lowestPriceOptionsProvider = null,
        SalableResolverInterface $salableResolver = null,
        MinimalPriceCalculatorInterface $minimalPriceCalculator = null
    ) {
        parent::__construct(
            $context,
            $saleableItem,
            $price,
            $rendererPool,
            $data,
            $salableResolver,
            $minimalPriceCalculator
        );
        $this->lowestPriceOptionsProvider = $lowestPriceOptionsProvider ?:
            ObjectManager::getInstance()->get(LowestPriceOptionsProviderInterface::class);
    }

    public function hasSpecialPrice()
    {
        $product = $this->getSaleableItem();
        foreach ($this->lowestPriceOptionsProvider->getProducts($product) as $subProduct) {
            $regularPrice = $subProduct->getPriceInfo()->getPrice(RegularPrice::PRICE_CODE)->getValue();
            $finalPrice = $subProduct->getPriceInfo()->getPrice(FinalPrice::PRICE_CODE)->getValue();
            if ($finalPrice < $regularPrice) {
                return true;
            }
        }
        return false;
    }
}