<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * 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@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Paginator

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

/**

 * @see Zend_Paginator_ScrollingStyle_Interface

 */

require_once 'Zend/Paginator/ScrollingStyle/Interface.php';

/**

 * A Yahoo! Search-like scrolling style.  The cursor will advance to

 * the middle of the range, then remain there until the user reaches

 * the end of the page set, at which point it will continue on to

 * the end of the range and the last page in the set.

 *

 * @link       http://search.yahoo.com/search?p=Zend+Framework

 * @category   Zend

 * @package    Zend_Paginator

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Paginator_ScrollingStyle_Sliding implements Zend_Paginator_ScrollingStyle_Interface

{

    /**

     * Returns an array of "local" pages given a page number and range.

     *

     * @param  Zend_Paginator $paginator

     * @param  integer $pageRange (Optional) Page range

     * @return array

     */

    public function getPages(Zend_Paginator $paginator, $pageRange = null)

    {

        if ($pageRange === null) {

            $pageRange = $paginator->getPageRange();

        }

        $pageNumber = $paginator->getCurrentPageNumber();

        $pageCount  = count($paginator);

        if ($pageRange > $pageCount) {

            $pageRange = $pageCount;

        }

        $delta = ceil($pageRange / 2);

        if ($pageNumber - $delta > $pageCount - $pageRange) {

            $lowerBound = $pageCount - $pageRange + 1;

            $upperBound = $pageCount;

        } else {

            if ($pageNumber - $delta < 0) {

                $delta = $pageNumber;

            }

            $offset     = $pageNumber - $delta;

            $lowerBound = $offset + 1;

            $upperBound = $offset + $pageRange;

        }

        return $paginator->getPagesInRange($lowerBound, $upperBound);

    }