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Name File: category.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Form
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

JFormHelper::loadFieldClass('list');

/**
 * Form Field class for the Joomla Platform.
 * Supports an HTML select list of categories
 *
 * @package     Joomla.Platform
 * @subpackage  Form
 * @since       11.1
 */
class JFormFieldCategory extends JFormFieldList
{
	/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  11.1
	 */
	public $type = 'Category';

	/**
	 * Method to get the field options for category
	 * Use the extension attribute in a form to specify the.specific extension for
	 * which categories should be displayed.
	 * Use the show_root attribute to specify whether to show the global category root in the list.
	 *
	 * @return  array    The field option objects.
	 *
	 * @since   11.1
	 */
	protected function getOptions()
	{
		// Initialise variables.
		$options = array();
		$extension = $this->element['extension'] ? (string) $this->element['extension'] : (string) $this->element['scope'];
		$published = (string) $this->element['published'];
		$name = (string) $this->element['name'];

		// Load the category options for a given extension.
		if (!empty($extension))
		{

			// Filter over published state or not depending upon if it is present.
			if ($published)
			{
				$options = JHtml::_('category.options', $extension, array('filter.published' => explode(',', $published)));
			}
			else
			{
				$options = JHtml::_('category.options', $extension);
			}

			// Verify permissions.  If the action attribute is set, then we scan the options.
			if ((string) $this->element['action'])
			{

				// Get the current user object.
				$user = JFactory::getUser();

				// For new items we want a list of categories you are allowed to create in.
				if (!$this->form->getValue($name))
				{
					foreach ($options as $i => $option) {
						// To take save or create in a category you need to have create rights for that category
						// unless the item is already in that category.
						// Unset the option if the user isn't authorised for it. In this field assets are always categories.
						if ($user->authorise('core.create', $extension . '.category.' . $option->value) != true )
						{
							unset($options[$i]);
						}
					}
				}
				// If you have an existing category id things are more complex.
				else
				{
					$categoryOld = $this->form->getValue($name);
					foreach ($options as $i => $option)
					{
						// If you are only allowed to edit in this category but not edit.state, you should not get any
						// option to change the category.
						if ($user->authorise('core.edit.state', $extension . '.category.' . $categoryOld) != true)
						{
							if ($option->value != $categoryOld)
							{
								unset($options[$i]);
							}
						}
						// However, if you can edit.state you can also move this to another category for which you have
						// create permission and you should also still be able to save in the current category.
						elseif
							(($user->authorise('core.create', $extension . '.category.' . $option->value) != true)
							&& $option->value != $categoryOld)
						{
							unset($options[$i]);
						}
					}
				}
			}

			if (isset($this->element['show_root']))
			{
				array_unshift($options, JHtml::_('select.option', '0', JText::_('JGLOBAL_ROOT')));
			}
		}
		else
		{
			JError::raiseWarning(500, JText::_('JLIB_FORM_ERROR_FIELDS_CATEGORY_ERROR_EXTENSION_EMPTY'));
		}

		// Merge any additional options in the XML definition.
		$options = array_merge(parent::getOptions(), $options);

		return $options;
	}
}