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<?php
# ***** BEGIN LICENSE BLOCK *****
# This file is part of Clearbricks.
# Copyright (c) 2006 Olivier Meunier and contributors. All rights
# reserved.
#
# Clearbricks is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Clearbricks is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Clearbricks; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# ***** END LICENSE BLOCK *****
class pager
{
private $env;
private $nb_elements;
private $nb_per_page;
private $nb_pages_per_group;
private $nb_pages;
private $nb_groups;
public $index_start;
public $index_end;
private $env_group;
private $index_group_start;
private $index_group_end;
private $page_url = null;
public $base_url = null;
public $var_page = 'page';
public $html_cur_page = '<strong>%s</strong>';
public $html_link_sep = '-';
public $html_prev = '«prev.';
public $html_next = 'next»';
public $html_prev_grp = '...';
public $html_next_grp = '...';
public function __construct($env,$nb_elements,$nb_per_page=10,$nb_pages_per_group=10)
{
$this->env = abs((integer) $env);
$this->nb_elements = abs((integer) $nb_elements);
$this->nb_per_page = abs((integer) $nb_per_page);
$this->nb_pages_per_group = abs((integer) $nb_pages_per_group);
# Pages count
$this->nb_pages = ceil($this->nb_elements/$this->nb_per_page);
# Fix env value
if ($this->env > $this->nb_pages || $this->env < 1) {
$this->env = 1;
}
# Groups count
$this->nb_groups = (integer) ceil($this->nb_pages/$this->nb_pages_per_group);
# Page first element index
$this->index_start = ($this->env-1)*$this->nb_per_page;
# Page last element index
$this->index_end = $this->index_start+$this->nb_per_page-1;
if($this->index_end >= $this->nb_elements) {
$this->index_end = $this->nb_elements-1;
}
# Current group
$this->env_group = (integer) ceil($this->env/$this->nb_pages_per_group);
# Group first page index
$this->index_group_start = ($this->env_group-1)*$this->nb_pages_per_group+1;
# Group last page index
$this->index_group_end = $this->index_group_start+$this->nb_pages_per_group-1;
if($this->index_group_end > $this->nb_pages) {
$this->index_group_end = $this->nb_pages;
}
}
public function getLinks()
{
$htmlLinks = '';
$htmlPrev = '';
$htmlNext = '';
$htmlPrevGrp = '';
$htmlNextGrp = '';
$this->setURL();
for($i=$this->index_group_start; $i<=$this->index_group_end; $i++)
{
if($i == $this->env) {
$htmlLinks .= sprintf($this->html_cur_page,$i);
} else {
$htmlLinks .= '<a href="'.sprintf($this->page_url,$i).'">'.$i.'</a>';
}
if($i != $this->index_group_end) {
$htmlLinks .= $this->html_link_sep;
}
}
# Previous page
if($this->env != 1) {
$htmlPrev = '<a href="'.sprintf($this->page_url,$this->env-1).'">'.
$htmlPrev .= $this->html_prev.'</a> ';
}
# Next page
if($this->env != $this->nb_pages) {
$htmlNext = ' <a href="'.sprintf($this->page_url,$this->env+1).'">';
$htmlNext .= $this->html_next.'</a>';
}
# Previous group
if($this->env_group != 1) {
$htmlPrevGrp = ' <a href="'.sprintf($this->page_url,$this->index_group_start - $this->nb_pages_per_group).'">';
$htmlPrevGrp .= $this->html_prev_grp.'</a> ';
}
# Next group
if($this->env_group != $this->nb_groups) {
$htmlNextGrp = ' <a href="'.sprintf($this->page_url,$this->index_group_end+1).'">';
$htmlNextGrp .= $this->html_next_grp.'</a> ';
}
$res = $htmlPrev.
$htmlPrevGrp.
$htmlLinks.
$htmlNextGrp.
$htmlNext;
return $this->nb_elements > 0 ? $res : '';
}
private function setURL()
{
if ($this->base_url !== null) {
$this->page_url = $this->base_url;
return;
}
$url = $_SERVER['REQUEST_URI'];
# Removing session information
if (session_id())
{
$url = preg_replace('/'.preg_quote(session_name().'='.session_id(),'/').'([&]?)/','',$url);
$url = preg_replace('/&$/','',$url);
}
# Escape page_url for sprintf
$url = preg_replace('/%/','%%',$url);
# Changing page ref
if (preg_match('/[?&]'.$this->var_page.'=[0-9]+/',$url))
{
$url = preg_replace('/([?&]'.$this->var_page.'=)[0-9]+/','$1%1$d',$url);
}
elseif (preg_match('/[?]/',$url))
{
$url .= '&'.$this->var_page.'=%1$d';
}
else
{
$url .= '?'.$this->var_page.'=%1$d';
}
$this->page_url = html::escapeHTML($url);
}
public function debug()
{
return
"Elements per page ........... ".$this->nb_per_page."\n".
'Pages per group.............. '.$this->nb_pages_per_group."\n".
"Elements count .............. ".$this->nb_elements."\n".
'Pages ....................... '.$this->nb_pages."\n".
'Groups ...................... '.$this->nb_groups."\n\n".
'Current page .................'.$this->env."\n".
'Start index ................. '.$this->index_start."\n".
'End index ................... '.$this->index_end."\n".
'Current group ............... '.$this->env_group."\n".
'Group first page index ...... '.$this->index_group_start."\n".
'Group last page index ....... '.$this->index_group_end;
}
}
?>