Qtyincrements.php

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<?php
namespace Magento\CatalogInventory\Block;

use Magento\Framework\DataObject\IdentityInterface;
use Magento\Framework\View\Element\Template;

class Qtyincrements extends Template implements IdentityInterface
{
    protected $_qtyIncrements;

    protected $_coreRegistry;

    protected $stockRegistry;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\CatalogInventory\Api\StockRegistryInterface $stockRegistry,
        array $data = []
    ) {
        $this->_coreRegistry = $registry;
        $this->stockRegistry = $stockRegistry;
        parent::__construct($context, $data);
    }

    public function getProduct()
    {
        return $this->_coreRegistry->registry('current_product');
    }

    public function getProductName()
    {
        return $this->getProduct()->getName();
    }

    public function getProductQtyIncrements()
    {
        if ($this->_qtyIncrements === null) {
            $stockItem = $this->stockRegistry->getStockItem(
                $this->getProduct()->getId(),
                $this->getProduct()->getStore()->getWebsiteId()
            );
            $this->_qtyIncrements = $stockItem->getQtyIncrements();
            if (!$this->getProduct()->isSaleable()) {
                $this->_qtyIncrements = false;
            }
        }
        return $this->_qtyIncrements;
    }

    public function getIdentities()
    {
        return $this->getProduct()->getIdentities();
    }
}