Primo Committ

vendor/laravel/framework/src/Illuminate/Pagination/UrlWindow.php

@@ -0,0 +1,220 @@
+<?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();
+    }
+}