<?php
/**
* This file is part of the CodeIgniter 4 framework.
*
* (c) CodeIgniter Foundation <admin@codeigniter.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace CodeIgniter\Pager;
use CodeIgniter\HTTP\Exceptions\HTTPException;
use CodeIgniter\Pager\Exceptions\PagerException;
use CodeIgniter\View\RendererInterface;
use Config\Pager as PagerConfig;
/**
* Class Pager
*
* The Pager class provides semi-automatic and manual methods for creating
* pagination links and reading the current url's query variable, "page"
* to determine the current page. This class can support multiple
* paginations on a single page.
*/
class Pager implements PagerInterface
{
/**
* The group data.
*
* @var array
*/
protected $groups = [];
/**
* URI segment for groups if provided.
*
* @var array
*/
protected $segment = [];
/**
* Our configuration instance.
*
* @var PagerConfig
*/
protected $config;
/**
* The view engine to render the links with.
*
* @var RendererInterface
*/
protected $view;
/**
* List of only permitted queries
*
* @var array
*/
protected $only = [];
//--------------------------------------------------------------------
/**
* Constructor.
*
* @param PagerConfig $config
* @param RendererInterface $view
*/
public function __construct(PagerConfig $config, RendererInterface $view)
{
$this->config = $config;
$this->view = $view;
}
//--------------------------------------------------------------------
/**
* Handles creating and displaying the
*
* @param string $group
* @param string $template The output template alias to render.
*
* @return string
*/
public function links(string $group = 'default', string $template = 'default_full'): string
{
$this->ensureGroup($group);
return $this->displayLinks($group, $template);
}
//--------------------------------------------------------------------
/**
* Creates simple Next/Previous links, instead of full pagination.
*
* @param string $group
* @param string $template
*
* @return string
*/
public function simpleLinks(string $group = 'default', string $template = 'default_simple'): string
{
$this->ensureGroup($group);
return $this->displayLinks($group, $template);
}
//--------------------------------------------------------------------
/**
* Allows for a simple, manual, form of pagination where all of the data
* is provided by the user. The URL is the current URI.
*
* @param integer $page
* @param integer|null $perPage
* @param integer $total
* @param string $template The output template alias to render.
* @param integer $segment (whether page number is provided by URI segment)
* @param string|null $group optional group (i.e. if we'd like to define custom path)
*
* @return string
*/
public function makeLinks(int $page, ?int $perPage, int $total, string $template = 'default_full', int $segment = 0, ?string $group = 'default'): string
{
$group = $group === '' ? 'default' : $group;
$this->store($group, $page, $perPage ?? $this->config->perPage, $total, $segment);
return $this->displayLinks($group, $template);
}
//--------------------------------------------------------------------
/**
* Does the actual work of displaying the view file. Used internally
* by links(), simpleLinks(), and makeLinks().
*
* @param string $group
* @param string $template
*
* @return string
*/
protected function displayLinks(string $group, string $template): string
{
$pager = new PagerRenderer($this->getDetails($group));
if (! array_key_exists($template, $this->config->templates))
{
throw PagerException::forInvalidTemplate($template);
}
return $this->view->setVar('pager', $pager)
->render($this->config->templates[$template]);
}
//--------------------------------------------------------------------
/**
* Stores a set of pagination data for later display. Most commonly used
* by the model to automate the process.
*
* @param string $group
* @param integer $page
* @param integer|null $perPage
* @param integer $total
* @param integer $segment
*
* @return $this
*/
public function store(string $group, int $page, ?int $perPage, int $total, int $segment = 0)
{
if ($segment)
{
$this->setSegment($segment, $group);
}
$this->ensureGroup($group, $perPage);
if ($segment > 0 && $this->groups[$group]['currentPage'] > 0)
{
$page = $this->groups[$group]['currentPage'];
}
$perPage = $perPage ?? $this->config->perPage;
$pageCount = (int) ceil($total / $perPage);
$this->groups[$group]['currentPage'] = $page > $pageCount ? $pageCount : $page;
$this->groups[$group]['perPage'] = $perPage;
$this->groups[$group]['total'] = $total;
$this->groups[$group]['pageCount'] = $pageCount;
return $this;
}
//--------------------------------------------------------------------
/**
* Sets segment for a group.
*
* @param integer $number
* @param string $group
*
* @return mixed
*/
public function setSegment(int $number, string $group = 'default')
{
$this->segment[$group] = $number;
return $this;
}
//--------------------------------------------------------------------
/**
* Sets the path that an aliased group of links will use.
*
* @param string $path
* @param string $group
*
* @return mixed
*/
public function setPath(string $path, string $group = 'default')
{
$this->ensureGroup($group);
$this->groups[$group]['uri']->setPath($path);
return $this;
}
//--------------------------------------------------------------------
/**
* Returns the total number of items in data store.
*
* @param string $group
*
* @return integer
*/
public function getTotal(string $group = 'default'): int
{
$this->ensureGroup($group);
return $this->groups[$group]['total'];
}
//--------------------------------------------------------------------
/**
* Returns the total number of pages.
*
* @param string $group
*
* @return integer
*/
public function getPageCount(string $group = 'default'): int
{
$this->ensureGroup($group);
return $this->groups[$group]['pageCount'];
}
//--------------------------------------------------------------------
/**
* Returns the number of the current page of results.
*
* @param string $group
*
* @return integer
*/
public function getCurrentPage(string $group = 'default'): int
{
$this->ensureGroup($group);
return $this->groups[$group]['currentPage'] ?: 1;
}
//--------------------------------------------------------------------
/**
* Tells whether this group of results has any more pages of results.
*
* @param string $group
*
* @return boolean
*/
public function hasMore(string $group = 'default'): bool
{
$this->ensureGroup($group);
return ($this->groups[$group]['currentPage'] * $this->groups[$group]['perPage']) < $this->groups[$group]['total'];
}
//--------------------------------------------------------------------
/**
* Returns the last page, if we have a total that we can calculate with.
*
* @param string $group
*
* @return integer|null
*/
public function getLastPage(string $group = 'default')
{
$this->ensureGroup($group);
if (! is_numeric($this->groups[$group]['total']) || ! is_numeric($this->groups[$group]['perPage']))
{
return null;
}
return (int) ceil($this->groups[$group]['total'] / $this->groups[$group]['perPage']);
}
//--------------------------------------------------------------------
/**
* Determines the first page # that should be shown.
*
* @param string $group
*
* @return integer
*/
public function getFirstPage(string $group = 'default'): int
{
$this->ensureGroup($group);
// @todo determine based on a 'surroundCount' value
return 1;
}
//--------------------------------------------------------------------
/**
* Returns the URI for a specific page for the specified group.
*
* @param integer|null $page
* @param string $group
* @param boolean $returnObject
*
* @return string|\CodeIgniter\HTTP\URI
*/
public function getPageURI(int $page = null, string $group = 'default', bool $returnObject = false)
{
$this->ensureGroup($group);
/**
* @var \CodeIgniter\HTTP\URI $uri
*/
$uri = $this->groups[$group]['uri'];
$segment = $this->segment[$group] ?? 0;
if ($segment)
{
$uri->setSegment($segment, $page);
}
else
{
$uri->addQuery($this->groups[$group]['pageSelector'], $page);
}
if ($this->only)
{
$query = array_intersect_key($_GET, array_flip($this->only));
if (! $segment)
{
$query[$this->groups[$group]['pageSelector']] = $page;
}
$uri->setQueryArray($query);
}
return $returnObject === true ? $uri : (string) $uri;
}
//--------------------------------------------------------------------
/**
* Returns the full URI to the next page of results, or null.
*
* @param string $group
* @param boolean $returnObject
*
* @return string|null
*/
public function getNextPageURI(string $group = 'default', bool $returnObject = false)
{
$this->ensureGroup($group);
$last = $this->getLastPage($group);
$curr = $this->getCurrentPage($group);
$page = null;
if (! empty($last) && ! empty($curr) && $last === $curr)
{
return null;
}
if ($last > $curr)
{
$page = $curr + 1;
}
return $this->getPageURI($page, $group, $returnObject);
}
//--------------------------------------------------------------------
/**
* Returns the full URL to the previous page of results, or null.
*
* @param string $group
* @param boolean $returnObject
*
* @return string|null
*/
public function getPreviousPageURI(string $group = 'default', bool $returnObject = false)
{
$this->ensureGroup($group);
$first = $this->getFirstPage($group);
$curr = $this->getCurrentPage($group);
$page = null;
if (! empty($first) && ! empty($curr) && $first === $curr)
{
return null;
}
if ($first < $curr)
{
$page = $curr - 1;
}
return $this->getPageURI($page, $group, $returnObject);
}
//--------------------------------------------------------------------
/**
* Returns the number of results per page that should be shown.
*
* @param string $group
*
* @return integer
*/
public function getPerPage(string $group = 'default'): int
{
$this->ensureGroup($group);
return (int) $this->groups[$group]['perPage'];
}
//--------------------------------------------------------------------
/**
* Returns an array with details about the results, including
* total, per_page, current_page, last_page, next_url, prev_url, from, to.
* Does not include the actual data. This data is suitable for adding
* a 'data' object to with the result set and converting to JSON.
*
* @param string $group
*
* @return array
*/
public function getDetails(string $group = 'default'): array
{
if (! array_key_exists($group, $this->groups))
{
throw PagerException::forInvalidPaginationGroup($group);
}
$newGroup = $this->groups[$group];
$newGroup['next'] = $this->getNextPageURI($group);
$newGroup['previous'] = $this->getPreviousPageURI($group);
$newGroup['segment'] = $this->segment[$group] ?? 0;
return $newGroup;
}
//--------------------------------------------------------------------
/**
* Sets only allowed queries on pagination links.
*
* @param array $queries
*
* @return Pager
*/
public function only(array $queries):Pager
{
$this->only = $queries;
return $this;
}
//--------------------------------------------------------------------
/**
* Ensures that an array exists for the group specified.
*
* @param string $group
* @param integer $perPage
*/
protected function ensureGroup(string $group, int $perPage = null)
{
if (array_key_exists($group, $this->groups))
{
return;
}
$this->groups[$group] = [
'uri' => clone current_url(true),
'hasMore' => false,
'total' => null,
'perPage' => $perPage ?? $this->config->perPage,
'pageCount' => 1,
'pageSelector' => $group === 'default' ? 'page' : 'page_' . $group,
];
$this->calculateCurrentPage($group);
if ($_GET)
{
$this->groups[$group]['uri'] = $this->groups[$group]['uri']->setQueryArray($_GET);
}
}
//--------------------------------------------------------------------
/**
* Calculating the current page
*
* @param string $group
*/
protected function calculateCurrentPage(string $group)
{
if (array_key_exists($group, $this->segment))
{
try
{
$this->groups[$group]['currentPage'] = (int) $this->groups[$group]['uri']->setSilent(false)->getSegment($this->segment[$group]);
}
catch (HTTPException $e)
{
$this->groups[$group]['currentPage'] = 1;
}
}
else
{
$pageSelector = $this->groups[$group]['pageSelector'];
$page = (int) ($_GET[$pageSelector] ?? 1);
$this->groups[$group]['currentPage'] = $page < 1 ? 1 : $page;
}
}
//--------------------------------------------------------------------
}
MGatner