<?php
namespace Illuminate\Pagination;
use Illuminate\Contracts\Pagination\LengthAwarePaginator as PaginatorContract;
class UrlWindow
{
/**
* The paginator implementation.
*
* @var \Illuminate\Contracts\Pagination\LengthAwarePaginator
*/
protected $paginator;
/**
* Create a new URL window instance.
*
* @param \Illuminate\Contracts\Pagination\LengthAwarePaginator $paginator
* @return void
*/
public function __construct(PaginatorContract $paginator)
{
$this->paginator = $paginator;
}
/**
* Create a new URL window instance.
*
* @param \Illuminate\Contracts\Pagination\LengthAwarePaginator $paginator
* @return array
*/
public static function make(PaginatorContract $paginator)
{
return (new static($paginator))->get();
}
/**
* Get the window of URLs to be shown.
*
* @return array
*/
public function get()
{
$onEachSide = $this->paginator->onEachSide;
if ($this->paginator->lastPage() < ($onEachSide * 2) + 8) {
return $this->getSmallSlider();
}
return $this->getUrlSlider($onEachSide);
}
/**
* Get the slider of URLs there are not enough pages to slide.
*
* @return array
*/
protected function getSmallSlider()
{
return [
'first' => $this->paginator->getUrlRange(1, $this->lastPage()),
'slider' => null,
'last' => null,
];
}
/**
* Create a URL slider links.
*
* @param int $onEachSide
* @return array
*/
protected function getUrlSlider($onEachSide)
{
$window = $onEachSide + 4;
if (! $this->hasPages()) {
return ['first' => null, 'slider' => null, 'last' => null];
}
// If the current page is very close to the beginning of the page range, we will
// just render the beginning of the page range, followed by the last 2 of the
// links in this list, since we will not have room to create a full slider.
if ($this->currentPage() <= $window) {
return $this->getSliderTooCloseToBeginning($window, $onEachSide);
}
// If the current page is close to the ending of the page range we will just get
// this first couple pages, followed by a larger window of these ending pages
// since we're too close to the end of the list to create a full on slider.
elseif ($this->currentPage() > ($this->lastPage() - $window)) {
return $this->getSliderTooCloseToEnding($window, $onEachSide);
}
// If we have enough room on both sides of the current page to build a slider we
// will surround it with both the beginning and ending caps, with this window
// of pages in the middle providing a Google style sliding paginator setup.
return $this->getFullSlider($onEachSide);
}
/**
* Get the slider of URLs when too close to beginning of window.
*
* @param int $window
* @param int $onEachSide
* @return array
*/
protected function getSliderTooCloseToBeginning($window, $onEachSide)
{
return [
'first' => $this->paginator->getUrlRange(1, $window + $onEachSide),
'slider' => null,
'last' => $this->getFinish(),
];
}
/**
* Get the slider of URLs when too close to ending of window.
*
* @param int $window
* @param int $onEachSide
* @return array
*/
protected function getSliderTooCloseToEnding($window, $onEachSide)
{
$last = $this->paginator->getUrlRange(
$this->lastPage() - ($window + ($onEachSide - 1)),
$this->lastPage()
);
return [
'first' => $this->getStart(),
'slider' => null,
'last' => $last,
];
}
/**
* Get the slider of URLs when a full slider can be made.
*
* @param int $onEachSide
* @return array
*/
protected function getFullSlider($onEachSide)
{
return [
'first' => $this->getStart(),
'slider' => $this->getAdjacentUrlRange($onEachSide),
'last' => $this->getFinish(),
];
}
/**
* Get the page range for the current page window.
*
* @param int $onEachSide
* @return array
*/
public function getAdjacentUrlRange($onEachSide)
{
return $this->paginator->getUrlRange(
$this->currentPage() - $onEachSide,
$this->currentPage() + $onEachSide
);
}
/**
* Get the starting URLs of a pagination slider.
*
* @return array
*/
public function getStart()
{
return $this->paginator->getUrlRange(1, 2);
}
/**
* Get the ending URLs of a pagination slider.
*
* @return array
*/
public function getFinish()
{
return $this->paginator->getUrlRange(
$this->lastPage() - 1,
$this->lastPage()
);
}
/**
* Determine if the underlying paginator being presented has pages to show.
*
* @return bool
*/
public function hasPages()
{
return $this->paginator->lastPage() > 1;
}
/**
* Get the current page from the paginator.
*
* @return int
*/
protected function currentPage()
{
return $this->paginator->currentPage();
}
/**
* Get the last page from the paginator.
*
* @return int
*/
protected function lastPage()
{
return $this->paginator->lastPage();
}
}