pagenav.php

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<?php
// $Id: pagenav.php 949 2012-04-14 04:18:10Z i.bitcero $
// --------------------------------------------------------------
// Red México Common Utilities
// A framework for Red México Modules
// Author: Eduardo Cortés <i.bitcero@gmail.com>
// Email: i.bitcero@gmail.com
// License: GPL 2.0
// --------------------------------------------------------------

class RMPageNav
{
    private $total_results;
    private $items_page;
    private $current_page;
    private $steps = 5;
    private $url = '';
    private $showing = '';
    private $displayed = false;
    private $rendered = '';
    private $template = '';
    private $start = 0;
    
    function __construct($total_results, $items_page, $current_page, $steps=5){
        $this->total_results = $total_results;
        $this->items_page = $items_page;
        $this->current_page = $current_page;
        $this->steps = $steps;
        RMTemplate::get()->add_style('pagenav.css', 'rmcommon');
    }
    
    public function target_url(){
                $num = func_num_args();
                if ($num>0){
                        $url = func_get_arg(0);
                        $this->url = $url;
                } else {
                        return $this->url;
                }
    }
    
    public function steps(){
                $num = func_num_args();
                if ($num>0){
                        $steps = func_get_arg(0);
                        $this->steps = $steps;
                } else {
                        return $this->steps;
                }
    }
    
    public function get_showing(){
                return $this->showing;
    }
    
    public function start(){
        return $this->start;
    }
    
    public function set_template($path){
        $this->template = $path;
    }
    
    public function render($caption, $showing=0){
                
                // If we have the content of render then return it
                if ($this->displayed){
                        return $this->rendered;
                }
                
                $total_pages = ceil($this->total_results / $this->items_page);
                $current_page = $this->current_page > $total_pages ? $total_pages : $this->current_page;
        $current_page = $current_page==0 ? 1: $current_page;
                $items_page = $this->items_page;
                $total_results = $this->total_results;
                $steps = $this->steps();
                $url = $this->url;
                
        if ($current_page==1){
            $first_element = 1;
        } else{
            $first_element = $total_results > 0 ? (($current_page * $items_page) - ($items_page)) + 1 : 0;
        }
                
                $last_element = $current_page*$items_page;
                $last_element = $last_element>$total_results ? $total_results : $last_element;
                $this->showing = sprintf(__('Showing <strong>%u</strong> to <strong>%u</strong> of <strong>%u</strong>.','rmcommon'), $first_element, $last_element, $total_results);
                
                if ($total_pages<=1) return;
                
                if($showing) $showing_legend = $this->showing;
                
                ob_start();
                
                $start = 1;
                                
                if ($current_page>$steps-1){
                        $start = $current_page-floor($steps/2);
                }
                //echo "$start>($total_pages - $steps) ? ($total_pages - $steps)+1 : $start;"; die();
                $start = $start>=($total_pages - $steps) && $start!=1 ? ($total_pages - $steps)+1 : $start;
                $start = $start<1 ? 1 : $start;
        $this->start = $start;
                
                $end = $start+($steps-1);
                $end = $end > $total_pages ? $total_pages : $end;
                
                if($this->template!='' && is_file($this->template)){
                    include $this->template;
                } else {
                    include RMTemplate::get()->get_template('navigation_pages.php', 'module', 'rmcommon');
                }
                
                $this->displayed = true;
                
                $this->rendered = ob_get_clean();
                return $this->rendered;
                
    }
    
    public function display($caption = true, $showing = 0){
                echo $this->render($caption, $showing);
    }
        
}