<?php
/**
* PageNavigator_ManualScroll is a class for creating page views that
* should be scrolled manually, i.e. a set of pages does not change unless
* the user clicks one of the buttons rendered by FormatMovePrevSet and
* FormatMoveNextSet.
*
* @author Stanislav Okhvat <stanis@ngs.ru>
* @version $Id: PageNavigator_ManualScroll.php,v 1.00 2002/02/20 11:40:00 stasokhvat Exp $
* @package PageNavigator_ManualScroll
* @access public
*/
class PageNavigator_ManualScroll extends PageNavigator
{
/**
* Number of pages to show within one set of pages.
*
* @var integer
* @access private
*/
var $pages_per_set;
/**
* Constructor. Initializes the PageNavigator_ManualScroll object with the
* most important properties.
*
* @param integer current page number
* @param integer number of records per one page
* @param integer total records. May be initialized later.
* @param integer number of pages to be displayed per one set of
* pages. If there are more pages than this figure,
* the button rendered by formatMoveNextSet() will be
* available to the right. Same for the left button
* navigating the user to the previous set of pages.
* @return void
* @access public
*/
function PageNavigator_ManualScroll($current_page=0, $records_per_page=15, $total_records=0, $pages_per_set=10, $query_vars='')
{
PageNavigator::PageNavigator($current_page, $records_per_page, $total_records, $query_vars);
$this->pages_per_set = $pages_per_set;
} // end func
/*
PagesPerSet
*/
function setPagesPerSet($pages_per_set)
{
$this->pages_per_set = $pages_per_set;
}
function getPagesPerSet()
{
return $this->pages_per_set;
}
/**
* Returns the set we are on.
*
* @return integer current set of pages
* @access public
*/
function getCurrentSet()
{
return floor(($this->current_page - 1) / $this->pages_per_set);
}
function preCalculateParameters()
{
$this->totalpages = $this->getTotalPages();
$this->startpage = ($this->getCurrentSet() * $this->pages_per_set) + 1;
if (($this->startpage + $this->pages_per_set - 1) > $this->totalpages)
{
$this->endpage = $this->totalpages;
}
else
{
$this->endpage = $this->startpage + $this->pages_per_set - 1;
}
} // end func preCalculateParameters
function render()
{
// do not allow to proceed if not initialized correctly
if ($this->total_records == 0)
{
return false;
}
// HEADER
$output = $this->formatHeader();
// GET INITIAL VARS
$this->preCalculateParameters(); // calculate totalpages, startpage, endpage
$set = $this->getCurrentSet();
// CACHE QUERY STRING STRIPPED OF VARIABLES NEEDED BY THIS CLASS
$this->setProcessedQueryString();
// first generate all cells containing links to various pages
$pages = '';
for ($int = $this->startpage; $int <= $this->endpage; $int++)
{
$pages .= ( ($int == $this->current_page) ?
$this->formatActivePage($int) :
$this->formatPage($int) );
}
// LINK TO PREVIOUS SET
if ($set > 0)
{
$prevset = $this->formatMovePrevSet($this->current_page - $this->pages_per_set);
}
else
{
$prevset = $this->empty_cell;
}
// LINK TO PREVIOUS PAGE
if ($this->current_page > 1)
{
$prevpage = $this->formatMovePrevious($this->current_page - 1);
}
else
{
$prevpage = $this->empty_cell;
}
// LINK TO NEXT PAGE
if ($this->current_page < $this->totalpages)
{
$nextpage = $this->formatMoveNext($this->current_page + 1);
}
else
{
$nextpage = $this->empty_cell;
}
// LINK TO NEXT SET
if ( ($this->endpage + 1) <= $this->totalpages )
{
$nextset = $this->formatMoveNextSet($this->endpage + 1);
}
else
{
$nextset = $this->empty_cell;
}
// RENDER PAGE NAVIGATION VIEW
$output .= $prevset.$prevpage.$pages.$nextpage.$nextset;
// ADD TABLE FOOTER
$output .= $this->formatFooter();
return $output;
} // end func render
} // end class PageNavigator_ManualScroll
?> |