221 lines
5.6 KiB
PHP
221 lines
5.6 KiB
PHP
<?php
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/*****************************************************************************
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* PageIndex.php
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* Contains key class PageIndex.
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*
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* Kabuki CMS (C) 2013-2015, Aaron van Geffen
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*****************************************************************************/
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class PageIndex
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{
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protected $base_url;
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protected $current_page = 1;
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protected $index_class = 'pagination';
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protected $items_per_page = 0;
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private $linkBuilder;
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protected $needsPageIndex = false;
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protected $num_pages = 1;
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protected $page_index = [];
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protected $page_slug = '%AMP%page=%PAGE%';
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protected $recordCount = 0;
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protected $sort_direction = null;
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protected $sort_order = null;
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protected $start = 0;
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public function __construct($options)
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{
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static $neededKeys = ['base_url', 'items_per_page', 'recordCount'];
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foreach ($neededKeys as $key)
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{
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if (!isset($options[$key]))
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throw new Exception('PageIndex: argument ' . $key . ' missing in options');
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$this->$key = $options[$key];
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}
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static $optionalKeys = ['index_class', 'linkBuilder', 'page_slug', 'sort_direction', 'sort_order', 'start'];
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foreach ($optionalKeys as $key)
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if (isset($options[$key]))
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$this->$key = $options[$key];
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$this->generatePageIndex();
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}
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private function buildLink($start = null, $order = null, $dir = null)
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{
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if (isset($this->linkBuilder))
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return call_user_func($this->linkBuilder, $start, $order, $dir);
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else
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return $this->getLink($start, $order, $dir);
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}
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protected function generatePageIndex()
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{
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/*
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Example 1:
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[1] [2] [3] [...] [c-2] [c-1] [c] [c+1] [c+2] [...] [n-2] [n-1] [n]
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\---------/ \-------------------------/ \-------------/
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lower current/contiguous pages upper
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Example 2:
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[1] [2] [3] [4] [5] [c] [6] [7] [...] [n/2] [...] [n-2] [n-1] [n]
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\---------/ \-----------------/ \---/ \-------------/
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lower current/cont. pgs. center upper
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*/
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$this->num_pages = ceil($this->recordCount / $this->items_per_page);
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$this->current_page = min(ceil($this->start / $this->items_per_page) + 1, $this->num_pages);
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if ($this->num_pages == 0)
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{
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$this->needsPageIndex = false;
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return;
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}
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$lowerLower = 1;
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$lowerUpper = min($this->num_pages, 3);
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$contigLower = max($lowerUpper + 1, max($this->current_page - 2, 1));
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$contigUpper = min($this->current_page + 2, $this->num_pages);
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$center = floor($this->num_pages / 2);
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$upperLower = max($contigUpper + 1, max(0, $this->num_pages - 2));
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$upperUpper = $this->num_pages;
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$this->page_index = [];
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// Lower pages
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for ($p = $lowerLower; $p <= $lowerUpper; $p++)
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$this->page_index[$p] = [
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'index' => $p,
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'is_selected' => $this->current_page == $p,
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'href'=> $this->buildLink(($p - 1) * $this->items_per_page, $this->sort_order, $this->sort_direction),
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];
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// The center of the page index.
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if ($center > $lowerUpper && $center < $contigLower)
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{
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// Gap?
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if ($lowerUpper != $center)
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$this->page_index[] = '...';
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$this->page_index[$center] = [
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'index' => $center,
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'is_selected' => $this->current_page == $center,
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'href'=> $this->buildLink(($center - 1) * $this->items_per_page, $this->sort_order, $this->sort_direction),
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];
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}
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// Gap?
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if ($contigLower != $p)
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$this->page_index[] = '...';
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// contig pages
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for ($p = $contigLower; $p <= $contigUpper; $p++)
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$this->page_index[$p] = [
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'index' => $p,
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'is_selected' => $this->current_page == $p,
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'href'=> $this->buildLink(($p - 1) * $this->items_per_page, $this->sort_order, $this->sort_direction),
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];
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// The center of the page index.
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if ($center > $contigUpper && $center < $upperLower)
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{
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// Gap?
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if ($contigUpper != $center)
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$this->page_index[] = '...';
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$this->page_index[$center] = [
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'index' => $center,
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'is_selected' => $this->current_page == $center,
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'href'=> $this->buildLink(($center - 1) * $this->items_per_page, $this->sort_order, $this->sort_direction),
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];
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}
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// Gap?
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if ($upperLower != $p)
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$this->page_index[] = '...';
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// Upper pages
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for ($p = $upperLower; $p <= $upperUpper; $p++)
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$this->page_index[$p] = [
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'index' => $p,
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'is_selected' => $this->current_page == $p,
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'href'=> $this->buildLink(($p - 1) * $this->items_per_page, $this->sort_order, $this->sort_direction),
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];
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// Previous page?
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if ($this->current_page > 1)
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$this->page_index['previous'] = $this->page_index[$this->current_page - 1];
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// Next page?
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if ($this->current_page < $this->num_pages)
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$this->page_index['next'] = $this->page_index[$this->current_page + 1];
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}
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public function getLink($start = null, $order = null, $dir = null)
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{
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$url = $this->base_url;
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$amp = strpos($this->base_url, '?') ? '&' : '?';
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if (!empty($start))
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{
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$page = $start !== '%d' ? ($start / $this->items_per_page) + 1 : $start;
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$url .= strtr($this->page_slug, ['%PAGE%' => $page, '%AMP%' => $amp]);
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$amp = '&';
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}
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if (!empty($order))
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{
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$url .= $amp . 'order=' . $order;
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$amp = '&';
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}
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if (!empty($dir))
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{
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$url .= $amp . 'dir=' . $dir;
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$amp = '&';
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}
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return $url;
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}
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public function getPageIndex()
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{
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return $this->page_index;
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}
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public function getItemsPerPage()
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{
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return $this->items_per_page;
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}
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public function getSortOrder()
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{
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return $this->sort_order;
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}
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public function getSortDirection()
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{
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return $this->sort_direction;
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}
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public function getPageIndexClass()
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{
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return $this->index_class;
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}
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public function getCurrentPage()
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{
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return $this->current_page;
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}
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public function getNumberOfPages()
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{
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return $this->num_pages;
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}
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public function getRecordCount()
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{
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return $this->recordCount;
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}
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}
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