<?php
namespace Rokanthemes\WidgetSubCategory\Block\Adminhtml\Widget;
Class Textarea extends \Magento\Backend\Block\Template{
    protected $_elementFactory;
    /**
     * @param \Magento\Backend\Block\Template\Context $context
     * @param \Magento\Framework\Data\Form\Element\Factory $elementFactory
     * @param array $data
     */
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Data\Form\Element\Factory $elementFactory,
        array $data = []
    ) {
        $this->_elementFactory = $elementFactory;
        parent::__construct($context, $data);
    }
    /**
     * Prepare chooser element HTML
     *
     * @param \Magento\Framework\Data\Form\Element\AbstractElement $element Form Element
     * @return \Magento\Framework\Data\Form\Element\AbstractElement
     */
    public function prepareElementHtml(\Magento\Framework\Data\Form\Element\AbstractElement $element)
    {
        $input = $this->_elementFactory->create("textarea", ['data' => $element->getData()]);
        $input->setId($element->getId());
        $input->setForm($element->getForm());
        $input->setClass("widget-option input-textarea admin__control-text");
        if ($element->getRequired()) {
            $input->addClass('required-entry');
        }
        $element->setData('after_element_html', $input->getElementHtml());
        return $element;
    }
}
