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/home/develito/httpdocs/libraries/src/Form/Field/ContenthistoryField.php

<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Form\Field;

defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Form\FormField;
use Joomla\CMS\Session\Session;
use Joomla\CMS\Table\Table;

/**
 * Field to select Content History from a modal list.
 *
 * @since  3.2
 */
class ContenthistoryField extends FormField
{
	/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  3.2
	 */
	public $type = 'ContentHistory';

/**
	 * Layout to render the label
	 *
	 * @var  string
	 */
	protected $layout = 'joomla.form.field.contenthistory';

/**
	 * Get the data that is going to be passed to the layout
	 *
	 * @return  array
	 */
	public function getLayoutData()
	{
		// Get the basic field data
		$data = parent::getLayoutData();

$typeId = Table::getInstance('Contenttype')->getTypeId($this->element['data-typeAlias']);
		$itemId = $this->form->getValue('id');
		$label  = \JText::_('JTOOLBAR_VERSIONS');

$link   = 'index.php?option=com_contenthistory&amp;view=history&amp;layout=modal&amp;tmpl=component&amp;field='
			. $this->id . '&amp;item_id=' . $itemId . '&amp;type_id=' . $typeId . '&amp;type_alias='
			. $this->element['data-typeAlias'] . '&amp;' . Session::getFormToken() . '=1';

$extraData = array(
				'type' => $typeId,
				'item' => $itemId,
				'label' => $label,
				'link' => $link,
		);

return array_merge($data, $extraData);
	}

/**
	 * Method to get the content history field input markup.
	 *
	 * @return  string  The field input markup.
	 *
	 * @since   3.2
	 */
	protected function getInput()
	{
		if (empty($this->layout))
		{
			throw new \UnexpectedValueException(sprintf('%s has no layout assigned.', $this->name));
		}

return $this->getRenderer($this->layout)->render($this->getLayoutData());
	}
}