Mister Spy Say ="Hello Kids ... :D"
 
 
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               | .  . |_ ___| |_ ___ _ __  \ `--. _ __  _   _
                | |\/| | / __| __/ _ \ '__|  `--. \ '_ \| | | |
                | |  | | \__ \ ||  __/ |    /\__/ / |_) | |_| |
                \_|  |_/_|___/\__\___|_|    \____/| .__/ \__, |
                                                 | |     __/ |
                                                 |_|    |___/
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Mister Spy

<?php
/**
 * CommonPlugin for phplist
 * 
 * This file is a part of CommonPlugin.
 *
 * @category  phplist
 * @package   CommonPlugin
 * @author    Duncan Cameron
 * @copyright 2011-2014 Duncan Cameron
 * @license   http://www.gnu.org/licenses/gpl.html GNU General Public License, Version 3
 * @link      http://forums.phplist.com/viewtopic.php?f=7&t=35427
 */

/**
 * This class provides pagination of results
 * 
 */
class CommonPlugin_Pager
{
    const START = 'start';
    const SHOW = 'show';

    private $controller;

    /**
     * The number of instances of this class that have been created
     * @var integer
     */
    static private $instances = 0;
    
    /**
     * URL query field names
     * @var integer
     */
    private $start;
    private $show;

    /**
     * Item fields
     * total : the total number of items in the result set
     * startCurrent : the start item index for the current page, 0-based
     * startFinal : the start item index for the final page, 0-based
     *
     * @var integer
     */
    private $total;
    private $startCurrent;
    private $startFinal;

    /**
     * The maximum number of items to be displayed on the current page
     * @var integer
     */
    private $pageSize;

    /**
     * The maximum number of items to be displayed on the current page for use in a URL
     * @var string
     */
    private $pageSizeStr;

    /**
     * List from which the user can select the number of items to display
     * @var array
     */
    private $itemsPerPage;

    /**
     * The default number of items to display when not specified in the URL
     * A value of null or 0 will display all items
     * @var integer
     */
    private $defaultItems;

    /**
     * The previous and next links for the entity being displayed
     *
     * @var string
     */
    private $linkPrev;
    private $linkNext;

    /**
     * Normalises an item index to be a multiple of $pageSize
     * @param int $i item index, 0-based
     * @return int
     * @access private
     */
    private function normalise($i)
    {
        return intval($i / $this->pageSize) * $this->pageSize;
    }

    /**
     * Calculates the page size from the URL SHOW parameter or the default
     * @return void
     * @access private
     */
    private function setPageSize()
    {
        if (isset($_GET[$this->show]) && strtolower($_GET[$this->show]) == 'all') {
            $this->pageSizeStr = 'All';
            $this->pageSize = $this->total;
        } elseif (isset($_GET[$this->show]) && ctype_digit($_GET[$this->show])) {
            $this->pageSize = $this->pageSizeStr = $_GET[$this->show];
        } elseif ($this->defaultItems) {
            $this->pageSize = $this->pageSizeStr = $this->defaultItems;
        } else {
            $this->pageSizeStr = 'All';
            $this->pageSize = $this->total;
        }
    }

    /**
     * Calculate the start item indices for the current page and the final page
     * @return void
     * @access private
     */
    private function setCurrentItem()
    {
        if ($this->pageSize == 0) {
            $this->startCurrent = $this->startFinal = 0;
            return;
        }

        $this->startFinal = $this->normalise($this->total - 1);
        $this->startCurrent = min(
            $this->startFinal,
            isset($_GET[$this->start]) && ctype_digit($_GET[$this->start])
                ? $this->normalise($_GET[$this->start])
                : 0
        );
    }
     /**
     * Generate the html for a navigation link, either as a link if active or text
     * @param string $text text for link
     * @param int $start start item index
     * @param boolean $active whether to create a link or just text
     * @return string a link or text, each will be html entity encoded
     * @access private
     */
   private function navigation($text, $start, $active)
    {
        return $active
            ? $this->pageLink($text, array($this->start => $start))
            : htmlspecialchars($text);
    }

    /**
     * Generate a link for the current page incorporating the $_GET parameters
     * @param string $text text for link
     * @param array $params additional parameters for the URL
     * @return string html <a> element, html entity encoded
     * @access private
     */
    private function pageLink($text, array $params)
    {
        return new CommonPlugin_PageLink(new CommonPlugin_PageURL(null,  array_merge($_GET, $params)), htmlspecialchars($text));
    }

    /**
     * Class constructor
     * @return void
     * @access public
     */
    public function __construct($controller)
    {
        $this->controller = $controller;
        $suffix = self::$instances == 0 ? '' : self::$instances;
        self::$instances++;
        $this->show = self::SHOW . $suffix;
        $this->start = self::START . $suffix;
        $this->setItemsPerPage(array(25, 50, 100), 50);
    }
    
    /**
     * Set the items per page array and default value
     * Adds 'All' as the final element of the array
     * @param array $itemsPerPage array of number of items per page
     * @param int $default default value
     * @return void
     * @access public
     */
    public function setItemsPerPage(array $itemsPerPage = array(), $default = null)
    {
        $this->itemsPerPage = $itemsPerPage;
        $this->itemsPerPage[] = 'All';
        $this->defaultItems = $default;
    }

    /**
     * @return void
     * @access public
     */
    public function setPrevNext($param, $prev, $next)
    {
        $prevArrow = '&#x25c0;';
        $nextArrow = '&#x25b6;';
        $this->linkPrev = $prev
            ? new CommonPlugin_PageLink(
                new CommonPlugin_PageURL(null, array_merge($_GET, array($param => $prev, $this->start => 0))),
                $prevArrow
            )
            : $prevArrow;
        $this->linkNext = $next
            ? new CommonPlugin_PageLink(
                new CommonPlugin_PageURL(null, array_merge($_GET, array($param => $next, $this->start => 0))),
                $nextArrow
            )
            : $nextArrow;
    }
    /**
     * Calculates the current item and the maximum number of items to be displayed
     * @return list (current index, number of items)
     * @access public
     */
    public function range($total)
    {
        $this->total = $total;
        $this->setPageSize();
        $this->setCurrentItem();
        return array($this->startCurrent, $this->pageSize);
    }

    /**
     * Generates the HTML for the pager using the pager template
     * @return string raw HTML
     * @access public
     */
    public function display()
    {
        $items = array();

        foreach ($this->itemsPerPage as $i) {
            $items[] = $this->pageSizeStr == $i 
            ? "<b>$i</b>" 
            : $this->pageLink($i, array($this->start => $this->startCurrent, $this->show => $i));
        }
        $vars = array(
            'range' => $this->total > 0
                ? $this->controller->i18n->get(
                    'Showing %d to %d of %d', 
                    $this->startCurrent + 1, min($this->startCurrent + $this->pageSize, $this->total), $this->total
                )
                : '&nbsp;',
            'first' => $this->navigation('<<', 0, $this->startCurrent > 0),
            'back' => $this->navigation('<', $this->startCurrent - $this->pageSize, $this->startCurrent > 0),
            'forward' => $this->navigation('>', $this->startCurrent + $this->pageSize, $this->startCurrent  < $this->startFinal),
            'last' => $this->navigation('>>', $this->startFinal, $this->startCurrent  < $this->startFinal),
            'show' => $this->controller->i18n->get('Show') . ' ' . implode(' | ', $items),
        );

        if (isset($this->linkPrev)) {
            $vars['prev'] = $this->linkPrev;
            $vars['next'] = $this->linkNext;
        }
        return $this->controller->render(dirname(__FILE__) . '/pager.tpl.php', $vars);
    }
}