Pagination.php

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<?php
namespace Ajax\semantic\widgets\datatable;
 
use Ajax\semantic\html\collections\menus\HtmlPaginationMenu;
 
class Pagination {
    private $items_per_page;
    private $page;
    private $visible;
    private $page_count;
    private $pages_visibles;
    private $row_count;
    private $menu;
 
    public function __construct($items_per_page=10,$pages_visibles=null,$page=1,$row_count=null){
        $this->items_per_page=$items_per_page;
        $this->row_count=$row_count;
        $this->page=$page;
        $this->setPagesVisibles($pages_visibles);
        $this->visible=true;
    }
 
    public function getObjects($objects){
        $auto=(!isset($this->row_count));
        $os=$objects;
        if(!\is_array($os)){
            $os=[];
            foreach ($objects as $o){
                $os[]=$o;
            }
        }
        $this->page_count = 0;
        $row_count=($auto)?\sizeof($os):$this->row_count;
        if (0 === $row_count) {
            $this->visible=false;
        } else {
 
            $this->page_count = (int)ceil($row_count / $this->items_per_page);
            $this->visible=$this->page_count>1;
            if($this->page > $this->page_count+1) {
                $this->page = 1;
            }
        }
        if($auto){
            $offset = ($this->page - 1) * $this->items_per_page;
            return array_slice($os, $offset,$this->items_per_page);
        }
        return $os;
    }
 
    public function getItemsPerPage() {
        return $this->items_per_page;
    }
 
    public function setItemsPerPage($items_per_page) {
        $this->items_per_page=$items_per_page;
        return $this;
    }
 
    public function getPage() {
        return $this->page;
    }
 
    public function setPage($page) {
        $this->page=$page;
        return $this;
    }
 
    public function getVisible() {
        return $this->visible;
    }
 
    public function setVisible($visible) {
        $this->visible=$visible;
        return $this;
    }
 
    public function getPageCount() {
        return $this->page_count;
    }
 
    public function getPagesNumbers(){
        $middle= (int)ceil(($this->pages_visibles-1)/ 2);
        $first=$this->page-$middle;
        if($first<1){
            $first=1;
        }
        $last=$first+$this->pages_visibles-1;
        if($last>$this->page_count){
            $last=$this->page_count;
        }
        return \range($first, $last);
    }
 
    public function setPagesVisibles($pages_visibles) {
        if(!isset($pages_visibles))
            $pages_visibles=(int)ceil($this->row_count / $this->items_per_page)+1;
        $this->pages_visibles=$pages_visibles;
        return $this;
    }
    
    public function generateMenu($identifier){
        $menu=new HtmlPaginationMenu("pagination-".$identifier,$this->getPagesNumbers());
        $menu->setMax($this->page_count);
        $menu->floatRight();
        $menu->setActivePage($this->getPage());
        return $this->menu=$menu;
    }
    
    public function getMenu() {
        return $this->menu;
    }
    
    public static function getPageOfRow($rownum,$itemsPerPage=10){
        $pageNum=0;$activeRow=0;
        while($activeRow<$rownum){
            $activeRow+=$itemsPerPage;
            $pageNum++;
        }
        return $pageNum;
    }
}