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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * Contains the Pager_Jumping class

 *

 * PHP versions 4 and 5

 *

 * LICENSE: Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * @category   HTML

 * @package    Pager

 * @author     Lorenzo Alberton <l dot alberton at quipo dot it>

 * @author     Richard Heyes <richard@phpguru.org>,

 * @copyright  2003-2006 Lorenzo Alberton, Richard Heyes

 * @license    http://www.debian.org/misc/bsd.license  BSD License (3 Clause)

 * @version    CVS: $Id: Jumping.php,v 1.2 2007-11-06 10:54:04 jp_milcent Exp $

 * @link       http://pear.php.net/package/Pager

 */

/**

 * require PEAR::Pager_Common base class

 */

require_once 'Pager/Common.php';

/**

 * Pager_Jumping - Generic data paging class  ("jumping window" style)

 * Handles paging a set of data. For usage see the example.php provided.

 *

 * @category   HTML

 * @package    Pager

 * @author     Lorenzo Alberton <l dot alberton at quipo dot it>

 * @author     Richard Heyes <richard@phpguru.org>,

 * @copyright  2003-2005 Lorenzo Alberton, Richard Heyes

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @link       http://pear.php.net/package/Pager

 */

class Pager_Jumping extends Pager_Common

{

    // {{{ Pager_Jumping()

    /**

     * Constructor

     *

     * @param array $options    An associative array of option names

     *                          and their values

     * @access public

     */

    function Pager_Jumping($options = array())

    {

        $err = $this->setOptions($options);

        if ($err !== PAGER_OK) {

            return $this->raiseError($this->errorMessage($err), $err);

        }

        $this->build();

    }

    // }}}

    // {{{ getPageIdByOffset()

    /**

     * Returns pageID for given offset

     *

     * @param $index Offset to get pageID for

     * @return int PageID for given offset

     */

    function getPageIdByOffset($index)

    {

        if (!isset($this->_pageData)) {

            $this->_generatePageData();

        }

        if (($index % $this->_perPage) > 0) {

            $pageID = ceil((float)$index / (float)$this->_perPage);

        } else {

            $pageID = $index / $this->_perPage;

        }

        return $pageID;

    }

    // }}}

    // {{{ getPageRangeByPageId()

    /**

     * Given a PageId, it returns the limits of the range of pages displayed.

     * While getOffsetByPageId() returns the offset of the data within the

     * current page, this method returns the offsets of the page numbers interval.

     * E.g., if you have pageId=3 and delta=10, it will return (1, 10).

     * PageID of 8 would give you (1, 10) as well, because 1 <= 8 <= 10.

     * PageID of 11 would give you (11, 20).

     * If the method is called without parameter, pageID is set to currentPage#.

     *

     * @param integer PageID to get offsets for

     * @return array  First and last offsets

     * @access public

     */

    function getPageRangeByPageId($pageid = null)

    {

        $pageid = isset($pageid) ? (int)$pageid : $this->_currentPage;

        if (isset($this->_pageData[$pageid]) || is_null($this->_itemData)) {

            // I'm sure I'm missing something here, but this formula works

            // so I'm using it until I find something simpler.

            $start = ((($pageid + (($this->_delta - ($pageid % $this->_delta))) % $this->_delta) / $this->_delta) - 1) * $this->_delta +1;

            return array(

                max($start, 1),

                min($start+$this->_delta-1, $this->_totalPages)

            );

        } else {

            return array(0, 0);

        }

    }

    // }}}

    // {{{ getLinks()

    /**

     * Returns back/next/first/last and page links,

     * both as ordered and associative array.

     *

     * NB: in original PEAR::Pager this method accepted two parameters,

     * $back_html and $next_html. Now the only parameter accepted is

     * an integer ($pageID), since the html text for prev/next links can

     * be set in the constructor. If a second parameter is provided, then

     * the method act as it previously did. This hack's only purpose is to

     * mantain backward compatibility.

     *

     * @param integer $pageID Optional pageID. If specified, links

     *                for that page are provided instead of current one.

     *                [ADDED IN NEW PAGER VERSION]

     * @param  string $next_html HTML to put inside the next link

     *                [deprecated: use the constructor instead]

     * @return array Back/pages/next links

     */

    function getLinks($pageID=null, $next_html='')

    {

        //BC hack

        if (!empty($next_html)) {

            $back_html = $pageID;

            $pageID    = null;

        } else {

            $back_html = '';

        }

        if (!is_null($pageID)) {

            $this->links = '';

            if ($this->_totalPages > $this->_delta) {

                $this->links .= $this->_printFirstPage();

            }

            $_sav = $this->_currentPage;

            $this->_currentPage = $pageID;

            $this->links .= $this->_getBackLink('', $back_html);

            $this->links .= $this->_getPageLinks();

            $this->links .= $this->_getNextLink('', $next_html);

            if ($this->_totalPages > $this->_delta) {

                $this->links .= $this->_printLastPage();

            }

        }

        $back  = str_replace(' ', '', $this->_getBackLink());

        $next  = str_replace(' ', '', $this->_getNextLink());

        $pages = $this->_getPageLinks();

        $first = $this->_printFirstPage();

        $last  = $this->_printLastPage();

        $all   = $this->links;

        $linkTags = $this->linkTags;

        if (!is_null($pageID)) {

            $this->_currentPage = $_sav;

        }

        return array(

            $back,

            $pages,

            trim($next),

            $first,

            $last,

            $all,

            $linkTags,

            'back'  => $back,

            'pages' => $pages,

            'next'  => $next,

            'first' => $first,

            'last'  => $last,

            'all'   => $all,

            'linktags' => $linkTags

        );

    }

    // }}}

    // {{{ _getPageLinks()

    /**

     * Returns pages link

     *

     * @param $url  URL to use in the link

     *              [deprecated: use the constructor instead]

     * @return string Links

     * @access private

     */

    function _getPageLinks($url = '')

    {

        //legacy setting... the preferred way to set an option now

        //is adding it to the constuctor

        if (!empty($url)) {

            $this->_path = $url;

        }

        //If there's only one page, don't display links

        if ($this->_clearIfVoid && ($this->_totalPages < 2)) {

            return '';

        }

        $links = '';

        $limits = $this->getPageRangeByPageId($this->_currentPage);

        for ($i=$limits[0]; $i<=min($limits[1], $this->_totalPages); $i++) {

            if ($i != $this->_currentPage) {

                $this->range[$i] = false;

                $this->_linkData[$this->_urlVar] = $i;

                $links .= $this->_renderLink($this->_altPage.' '.$i, $i);

            } else {

                $this->range[$i] = true;

                $links .= $this->_curPageSpanPre . $i . $this->_curPageSpanPost;

            }

            $links .= $this->_spacesBefore

                   . (($i != $this->_totalPages) ? $this->_separator.$this->_spacesAfter : '');

        }

        return $links;

    }

    // }}}

}

?>