GiftOptions.php

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<?php
namespace Magento\GiftMessage\Block\Cart;

use Magento\Backend\Block\Template\Context;
use Magento\Framework\Json\Encoder;
use Magento\GiftMessage\Model\CompositeConfigProvider;

class GiftOptions extends \Magento\Backend\Block\Template
{
    protected $_isScopePrivate = false;

    protected $jsLayout;

    protected $configProvider;

    protected $layoutProcessors;

    protected $jsonEncoder;

    public function __construct(
        Context $context,
        Encoder $jsonEncoder,
        CompositeConfigProvider $configProvider,
        array $layoutProcessors = [],
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->jsonEncoder = $jsonEncoder;
        $this->_isScopePrivate = true;
        $this->jsLayout = isset($data['jsLayout']) && is_array($data['jsLayout']) ? $data['jsLayout'] : [];
        $this->configProvider = $configProvider;
        $this->layoutProcessors = $layoutProcessors;
    }

    public function getJsLayout()
    {
        foreach ($this->layoutProcessors as $processor) {
            $this->jsLayout = $processor->process($this->jsLayout);
        }
        return $this->jsonEncoder->encode($this->jsLayout);
    }

    public function getGiftOptionsConfigJson()
    {
        return $this->jsonEncoder->encode($this->configProvider->getConfig());
    }
}