Add new Content\Pager class
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Hypolite Petovan
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<?php
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namespace Friendica\Content;
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use Friendica\Core\L10n;
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/**
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* The Pager has two very different output, Minimal and Full, see renderMinimal() and renderFull() for more details.
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*
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* @author Hypolite Petovan <mrpetovan@gmail.com>
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*/
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class Pager
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{
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/**
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* @var integer
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*/
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private $page = 1;
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/**
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* @var integer
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*/
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private $itemsPerPage = 50;
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/**
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* @var integer
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*/
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private $itemCount = 0;
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/**
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* @var string
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*/
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private $baseQueryString = '';
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/**
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* Instantiates a new Pager with the base parameters.
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*
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* Guesses the page number from the GET parameter 'page'.
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*
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* @param string $queryString The query string of the current page
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* @param integer $itemCount The total item count (for the full mode) or null (for the minimal mode)
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* @param integer $itemsPerPage An optional number of items per page to override the default value
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*/
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public function __construct($queryString, $itemCount = null, $itemsPerPage = 50)
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{
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$this->setQueryString($queryString);
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$this->setItemsPerPage($itemsPerPage);
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$this->setItemCount(defaults($itemCount, $this->getItemsPerPage()));
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$this->setPage(defaults($_GET, 'page', 1));
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}
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/**
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* Returns the start offset for a LIMIT clause. Starts at 0.
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*
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* @return integer
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*/
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public function getStart()
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{
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return max(0, ($this->page * $this->itemsPerPage) - $this->itemsPerPage);
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}
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/**
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* Returns the number of items per page
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*
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* @return integer
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*/
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public function getItemsPerPage()
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{
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return $this->itemsPerPage;
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}
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/**
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* Returns the current page number
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*
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* @return type
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*/
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public function getPage()
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{
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return $this->page;
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}
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/**
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* Returns the base query string.
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*
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* Warning: this isn't the same value as passed to the constructor.
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* See setQueryString for the inventory of transformations
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*
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* @see setBaseQuery()
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* @return string
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*/
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public function getBaseQueryString()
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{
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return $this->baseQueryString;
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}
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/**
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* Sets the number of items per page, 1 minimum.
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*
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* @param integer $itemsPerPage
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*/
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public function setItemsPerPage($itemsPerPage)
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{
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$this->itemsPerPage = max(1, intval($itemsPerPage));
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}
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/**
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* Sets the current page number. Starts at 1.
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*
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* @param integer $page
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*/
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public function setPage($page)
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{
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$this->page = max(1, intval($page));
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}
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/**
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* Sets the item count, 0 minimum.
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*
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* @param integer $itemCount
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*/
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public function setItemCount($itemCount)
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{
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$this->itemCount = max(0, intval($itemCount));
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}
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/**
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* Sets the base query string from a full query string.
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*
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* Strips the 'page' parameter, and remove the 'q=' string for some reason.
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*
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* @param string $queryString
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*/
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public function setQueryString($queryString)
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{
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$stripped = preg_replace('/([&?]page=[0-9]*)/', '', $queryString);
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$stripped = str_replace('q=', '', $stripped);
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$stripped = trim($stripped, '/');
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$this->baseQueryString = $stripped;
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}
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/**
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* Ensures the provided URI has its query string punctuation in order.
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*
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* @param string $uri
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* @return string
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*/
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private function ensureQueryParameter($uri)
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{
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if (strpos($uri, '?') === false && ($pos = strpos($uri, '&')) !== false) {
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$uri = substr($uri, 0, $pos) . '?' . substr($uri, $pos + 1);
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}
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return $uri;
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}
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/**
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* @brief Minimal pager (newer/older)
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*
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* This mode is intended for reverse chronological pages and presents only two links, newer (previous) and older (next).
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* The itemCount is the number of displayed items. If no items are displayed, the older button is disabled.
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*
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* Example usage:
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*
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* $pager = new Pager($a->query_string);
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*
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* $params = ['order' => ['sort_field' => true], 'limit' => [$pager->getStart(), $pager->getItemsPerPage()]];
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* $items = DBA::toArray(DBA::select($table, $fields, $condition, $params));
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*
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* $html = $pager->renderMinimal(count($items));
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*
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* @param integer $itemCount The number of displayed items on the page
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* @return string HTML string of the pager
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*/
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public function renderMinimal($itemCount)
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{
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$this->setItemCount($itemCount);
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$data = [
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'class' => 'pager',
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'prev' => [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=' . ($this->getPage() - 1)),
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'text' => L10n::t('newer'),
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'class' => 'previous' . ($this->getPage() == 1 ? ' disabled' : '')
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],
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'next' => [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=' . ($this->getPage() + 1)),
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'text' => L10n::t('older'),
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'class' => 'next' . ($this->itemCount <= 0 ? ' disabled' : '')
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]
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];
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$tpl = get_markup_template('paginate.tpl');
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return replace_macros($tpl, ['pager' => $data]);
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}
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/**
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* @brief Full pager (first / prev / 1 / 2 / ... / 14 / 15 / next / last)
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*
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* This mode presents page numbers as well as first, previous, next and last links.
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* The itemCount is the total number of items including those not displayed.
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*
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* Example usage:
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*
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* $total = DBA::count($table, $condition);
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*
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* $pager = new Pager($a->query_string, $total);
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*
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* $params = ['limit' => [$pager->getStart(), $pager->getItemsPerPage()]];
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* $items = DBA::toArray(DBA::select($table, $fields, $condition, $params));
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*
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* $html = $pager->renderFull();
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*
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* @return string HTML string of the pager
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*/
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public function renderFull()
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{
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$data = [];
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$data['class'] = 'pagination';
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if ($this->itemCount > $this->getItemsPerPage()) {
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$data['first'] = [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=1'),
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'text' => L10n::t('first'),
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'class' => $this->getPage() == 1 ? 'disabled' : ''
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];
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$data['prev'] = [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=' . ($this->getPage() - 1)),
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'text' => L10n::t('prev'),
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'class' => $this->getPage() == 1 ? 'disabled' : ''
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];
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$numpages = $this->itemCount / $this->getItemsPerPage();
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$numstart = 1;
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$numstop = $numpages;
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// Limit the number of displayed page number buttons.
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if ($numpages > 8) {
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$numstart = (($this->getPage() > 4) ? ($this->getPage() - 4) : 1);
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$numstop = (($this->getPage() > ($numpages - 7)) ? $numpages : ($numstart + 8));
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}
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$pages = [];
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for ($i = $numstart; $i <= $numstop; $i++) {
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if ($i == $this->getPage()) {
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$pages[$i] = [
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'url' => '#',
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'text' => $i,
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'class' => 'current active'
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];
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} else {
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$pages[$i] = [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=' . $i),
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'text' => $i,
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'class' => 'n'
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];
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}
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}
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if (($this->itemCount % $this->getItemsPerPage()) != 0) {
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if ($i == $this->getPage()) {
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$pages[$i] = [
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'url' => '#',
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'text' => $i,
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'class' => 'current active'
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];
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} else {
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$pages[$i] = [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=' . $i),
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'text' => $i,
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'class' => 'n'
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];
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}
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}
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$data['pages'] = $pages;
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$lastpage = (($numpages > intval($numpages)) ? intval($numpages)+1 : $numpages);
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$data['next'] = [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=' . ($this->getPage() + 1)),
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'text' => L10n::t('next'),
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'class' => $this->getPage() == $lastpage ? 'disabled' : ''
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];
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$data['last'] = [
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'url' => $this->ensureQueryParameter($this->baseQueryString . '&page=' . $lastpage),
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'text' => L10n::t('last'),
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'class' => $this->getPage() == $lastpage ? 'disabled' : ''
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];
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}
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$tpl = get_markup_template('paginate.tpl');
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return replace_macros($tpl, ['pager' => $data]);
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}
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}
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