AbstractItems.php

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<?php
namespace Magento\Sales\Block\Items;

class AbstractItems extends \Magento\Framework\View\Element\Template
{
    const DEFAULT_TYPE = 'default';

    public function getItemRenderer($type)
    {
        $rendererList = $this->getRendererListName() ? $this->getLayout()->getBlock(
            $this->getRendererListName()
        ) : $this->getChildBlock(
            'renderer.list'
        );
        if (!$rendererList) {
            throw new \RuntimeException('Renderer list for block "' . $this->getNameInLayout() . '" is not defined');
        }
        $overriddenTemplates = $this->getOverriddenTemplates() ?: [];
        $template = isset($overriddenTemplates[$type]) ? $overriddenTemplates[$type] : $this->getRendererTemplate();
        $renderer = $rendererList->getRenderer($type, self::DEFAULT_TYPE, $template);
        $renderer->setRenderedBlock($this);
        return $renderer;
    }

    protected function _prepareItem(\Magento\Framework\View\Element\AbstractBlock $renderer)
    {
        return $this;
    }

    protected function _getItemType(\Magento\Framework\DataObject $item)
    {
        if ($item->getOrderItem()) {
            $type = $item->getOrderItem()->getProductType();
        } elseif ($item instanceof \Magento\Quote\Model\Quote\Address\Item) {
            $type = $item->getQuoteItem()->getProductType();
        } else {
            $type = $item->getProductType();
        }
        return $type;
    }

    public function getItemHtml(\Magento\Framework\DataObject $item)
    {
        $type = $this->_getItemType($item);

        $block = $this->getItemRenderer($type)->setItem($item);
        $this->_prepareItem($block);
        return $block->toHtml();
    }
}