Wishlist.php

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<?php
namespace Magento\Wishlist\Block\Customer;

class Wishlist extends \Magento\Wishlist\Block\AbstractBlock
{
    protected $_optionsCfg = [];

    protected $_helperPool;

    protected $currentCustomer;

    protected $postDataHelper;

    public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Framework\App\Http\Context $httpContext,
        \Magento\Catalog\Helper\Product\ConfigurationPool $helperPool,
        \Magento\Customer\Helper\Session\CurrentCustomer $currentCustomer,
        \Magento\Framework\Data\Helper\PostHelper $postDataHelper,
        array $data = []
    ) {
        parent::__construct(
            $context,
            $httpContext,
            $data
        );
        $this->_helperPool = $helperPool;
        $this->currentCustomer = $currentCustomer;
        $this->postDataHelper = $postDataHelper;
    }

    protected function _prepareCollection($collection)
    {
        $collection->setInStockFilter(true)->setOrder('added_at', 'ASC');
        return $this;
    }

    protected function _prepareLayout()
    {
        parent::_prepareLayout();
        $this->pageConfig->getTitle()->set(__('My Wish List'));
    }

    public function getBackUrl()
    {
        return $this->getUrl('customer/account/');
    }

    public function setOptionsRenderCfgs($optionCfg)
    {
        $this->_optionsCfg = $optionCfg;
        return $this;
    }

    public function getOptionsRenderCfgs()
    {
        return $this->_optionsCfg;
    }

    public function addOptionsRenderCfg($productType, $helperName, $template = null)
    {
        $this->_optionsCfg[$productType] = ['helper' => $helperName, 'template' => $template];
        return $this;
    }

    public function getOptionsRenderCfg($productType)
    {
        if (isset($this->_optionsCfg[$productType])) {
            return $this->_optionsCfg[$productType];
        } elseif (isset($this->_optionsCfg['default'])) {
            return $this->_optionsCfg['default'];
        } else {
            return null;
        }
    }

    public function getDetailsHtml(\Magento\Wishlist\Model\Item $item)
    {
        $cfg = $this->getOptionsRenderCfg($item->getProduct()->getTypeId());
        if (!$cfg) {
            return '';
        }

        $block = $this->getChildBlock('item_options');
        if (!$block) {
            return '';
        }

        if ($cfg['template']) {
            $template = $cfg['template'];
        } else {
            $cfgDefault = $this->getOptionsRenderCfg('default');
            if (!$cfgDefault) {
                return '';
            }
            $template = $cfgDefault['template'];
        }

        $block->setTemplate($template);
        $block->setOptionList($this->_helperPool->get($cfg['helper'])->getOptions($item));
        return $block->toHtml();
    }

    public function getAddToCartQty(\Magento\Wishlist\Model\Item $item)
    {
        $qty = $this->getQty($item);
        return $qty ? $qty : 1;
    }

    public function getAddAllToCartParams()
    {
        return $this->postDataHelper->getPostData(
            $this->getUrl('wishlist/index/allcart'),
            ['wishlist_id' => $this->getWishlistInstance()->getId()]
        );
    }

    protected function _toHtml()
    {
        if ($this->currentCustomer->getCustomerId()) {
            return parent::_toHtml();
        } else {
            return '';
        }
    }
}