app/code/core/Mage/Adminhtml/Block/Promo/Widget/Chooser/Sku.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)
 */

/**
 * Adminhtml sales order create search products block
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Promo_Widget_Chooser_Sku extends Mage_Adminhtml_Block_Widget_Grid
{

    public function __construct($arguments=array())
    {
        parent::__construct($arguments);

        if ($this->getRequest()->getParam('current_grid_id')) {
            $this->setId($this->getRequest()->getParam('current_grid_id'));
        } else {
            $this->setId('skuChooserGrid_'.$this->getId());
        }

        $form = $this->getJsFormObject();
        $this->setRowClickCallback("$form.chooserGridRowClick.bind($form)");
        $this->setCheckboxCheckCallback("$form.chooserGridCheckboxCheck.bind($form)");
        $this->setRowInitCallback("$form.chooserGridRowInit.bind($form)");
        $this->setDefaultSort('sku');
        $this->setUseAjax(true);
        if ($this->getRequest()->getParam('collapse')) {
            $this->setIsCollapsed(true);
        }
    }

    /**
     * Retrieve quote store object
     * @return Mage_Core_Model_Store
     */
    public function getStore()
    {
        return Mage::app()->getStore();
    }

    protected function _addColumnFilterToCollection($column)
    {
        // Set custom filter for in product flag
        if ($column->getId() == 'in_products') {
            $selected = $this->_getSelectedProducts();
            if (empty($selected)) {
                $selected = '';
            }
            if ($column->getFilter()->getValue()) {
                $this->getCollection()->addFieldToFilter('sku', array('in'=>$selected));
            } else {
                $this->getCollection()->addFieldToFilter('sku', array('nin'=>$selected));
            }
        } else {
            parent::_addColumnFilterToCollection($column);
        }
        return $this;
    }

    protected function _prepareCollection()
    {
        $collection = Mage::getResourceModel('catalog/product_collection')
            ->setStoreId(0)
            ->addAttributeToSelect('name')
            ->addAttributeToFilter('type_id', array('in'=>array(
                Mage_Catalog_Model_Product_Type::TYPE_SIMPLE,
                Mage_Catalog_Model_Product_Type::TYPE_CONFIGURABLE,
                Mage_Downloadable_Model_Product_Type::TYPE_DOWNLOADABLE
            )));

        $this->setCollection($collection);

        return parent::_prepareCollection();
    }

    protected function _prepareColumns()
    {
        $this->addColumn('in_products', array(
            'header_css_class' => 'a-center',
            'type'      => 'checkbox',
            'name'      => 'in_products',
            'values'    => $this->_getSelectedProducts(),
            'align'     => 'center',
            'index'     => 'sku',
            'use_index' => true,
        ));

        $this->addColumn('entity_id', array(
            'header'    => Mage::helper('sales')->__('ID'),
            'sortable'  => true,
            'width'     => '60px',
            'index'     => 'entity_id'
        ));

        $this->addColumn('chooser_sku', array(
            'header'    => Mage::helper('sales')->__('SKU'),
            'name'      => 'chooser_sku',
            'width'     => '80px',
            'index'     => 'sku'
        ));
        $this->addColumn('chooser_name', array(
            'header'    => Mage::helper('sales')->__('Product Name'),
            'name'      => 'chooser_name',
            'index'     => 'name'
        ));

        return parent::_prepareColumns();
    }

    public function getGridUrl()
    {
        return $this->getUrl('*/*/chooser', array(
            '_current'          => true,
            'current_grid_id'   => $this->getId(),
            'collapse'          => null
        ));
    }

    protected function _getSelectedProducts()
    {
        $products = $this->getRequest()->getPost('selected', array());

        return $products;
    }

}

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