app/code/core/Mage/Adminhtml/Block/Catalog/Product/Helper/Form/Gallery/Content.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Catalog product form gallery content
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Catalog_Product_Helper_Form_Gallery_Content extends Mage_Adminhtml_Block_Widget
{

    public function __construct()
    {
        parent::__construct();
        $this->setTemplate('catalog/product/helper/gallery.phtml');
    }

    protected function _prepareLayout()
    {
        $this->setChild('uploader',
            $this->getLayout()->createBlock('adminhtml/media_uploader')
        );

        $this->getUploader()->getConfig()
            ->setUrl(Mage::getModel('adminhtml/url')->addSessionParam()->getUrl('*/catalog_product_gallery/upload'))
            ->setFileField('image')
            ->setFilters(array(
                'images' => array(
                    'label' => Mage::helper('adminhtml')->__('Images (.gif, .jpg, .png)'),
                    'files' => array('*.gif', '*.jpg','*.jpeg', '*.png')
                )
            ));

        return parent::_prepareLayout();
    }

    /**
     * Retrive uploader block
     *
     * @return Mage_Adminhtml_Block_Media_Uploader
     */
    public function getUploader()
    {
        return $this->getChild('uploader');
    }

    /**
     * Retrive uploader block html
     *
     * @return string
     */
    public function getUploaderHtml()
    {
        return $this->getChildHtml('uploader');
    }

    public function getJsObjectName()
    {
        return $this->getHtmlId() . 'JsObject';
    }

    public function getAddImagesButton()
    {
        return $this->getButtonHtml(
            Mage::helper('catalog')->__('Add New Images'),
            $this->getJsObjectName() . '.showUploader()',
            'add',
            $this->getHtmlId() . '_add_images_button'
        );
    }

    public function getImagesJson()
    {
        if(is_array($this->getElement()->getValue())) {
            $value = $this->getElement()->getValue();
            if(count($value['images'])>0) {
                foreach ($value['images'] as &$image) {
                    $image['url'] = Mage::getSingleton('catalog/product_media_config')
                                        ->getMediaUrl($image['file']);
                }
                return Zend_Json::encode($value['images']);
            }
        }
        return '[]';
    }

    public function getImagesValuesJson()
    {
        $values = array();
        foreach ($this->getMediaAttributes() as $attribute) {
            /* @var $attribute Mage_Eav_Model_Entity_Attribute */
            $values[$attribute->getAttributeCode()] = $this->getElement()->getDataObject()->getData(
                $attribute->getAttributeCode()
            );
        }
        return Zend_Json::encode($values);
    }

    /**
     * Enter description here...
     *
     * @return array
     */
    public function getImageTypes()
    {
        $imageTypes = array();
        foreach ($this->getMediaAttributes() as $attribute) {
            /* @var $attribute Mage_Eav_Model_Entity_Attribute */
            $imageTypes[$attribute->getAttributeCode()] = array(
                'label' => $attribute->getFrontend()->getLabel() . ' '
                         . Mage::helper('catalog')->__($this->getElement()->getScopeLabel($attribute)),
                'field' => $this->getElement()->getAttributeFieldName($attribute)
            );
        }
        return $imageTypes;
    }

    public function hasUseDefault()
    {
        foreach ($this->getMediaAttributes() as $attribute) {
            if($this->getElement()->canDisplayUseDefault($attribute))  {
                return true;
            }
        }

        return false;
    }

    /**
     * Enter description here...
     *
     * @return array
     */
    public function getMediaAttributes()
    {
        return $this->getElement()->getDataObject()->getMediaAttributes();
    }

    public function getImageTypesJson()
    {
        return Zend_Json::encode($this->getImageTypes());
    }

}

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