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275910d8b0
No clickable "jump to" at the moment, as we can not get the route url by the route name in js yet. Need to find another solution later. PHPBB3-12090
316 lines
12 KiB
PHP
316 lines
12 KiB
PHP
<?php
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/**
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*
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* @package phpbb
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* @copyright (c) 2013 phpBB Group
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* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
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*
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*/
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namespace phpbb;
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class pagination
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{
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/** @var \phpbb\template\template */
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protected $template;
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/** @var \phpbb\user */
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protected $user;
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/**
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* Constructor
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*
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* @param \phpbb\template\template $template
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* @param \phpbb\user $user
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* @param \phpbb\controller\helper $helper
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*/
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public function __construct(\phpbb\template\template $template, \phpbb\user $user, \phpbb\controller\helper $helper)
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{
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$this->template = $template;
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$this->user = $user;
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$this->helper = $helper;
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}
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/**
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* Generate a pagination link based on the url and the page information
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*
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* @param string $base_url is url prepended to all links generated within the function
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* If you use page numbers inside your controller route, base_url should contains a placeholder (%d)
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* for the page. Also be sure to specify the pagination path information into the start_name argument
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* @param string $on_page is the page for which we want to generate the link
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* @param string $start_name is the name of the parameter containing the first item of the given page (example: start=20)
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* If you use page numbers inside your controller route, start name should be the string
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* that should be removed for the first page (example: /page/%d)
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* @param int $per_page the number of items, posts, etc. to display per page, used to determine the number of pages to produce
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* @return URL for the requested page
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*/
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protected function generate_page_link($base_url, $on_page, $start_name, $per_page)
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{
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if (!is_string($base_url))
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{
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if (is_array($base_url['routes']))
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{
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$route = ($on_page > 1) ? $base_url['routes'][1] : $base_url['routes'][0];
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}
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else
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{
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$route = $base_url['routes'];
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}
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$params = (isset($base_url['params'])) ? $base_url['params'] : array();
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$is_amp = (isset($base_url['is_amp'])) ? $base_url['is_amp'] : true;
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$session_id = (isset($base_url['session_id'])) ? $base_url['session_id'] : false;
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if ($on_page > 1 || !is_array($base_url['routes']))
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{
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$params[$start_name] = (int) $on_page;
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}
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return $this->helper->route($route, $params, $is_amp, $session_id);
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}
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else
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{
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$url_delim = (strpos($base_url, '?') === false) ? '?' : ((strpos($base_url, '?') === strlen($base_url) - 1) ? '' : '&');
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return ($on_page > 1) ? $base_url . $url_delim . $start_name . '=' . (($on_page - 1) * $per_page) : $base_url;
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}
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}
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/**
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* Generate template rendered pagination
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* Allows full control of rendering of pagination with the template
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*
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* @param string $base_url is url prepended to all links generated within the function
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* If you use page numbers inside your controller route, base_url should contains a placeholder (%d)
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* for the page. Also be sure to specify the pagination path information into the start_name argument
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* @param string $block_var_name is the name assigned to the pagination data block within the template (example: <!-- BEGIN pagination -->)
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* @param string $start_name is the name of the parameter containing the first item of the given page (example: start=20)
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* If you use page numbers inside your controller route, start name should be the string
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* that should be removed for the first page (example: /page/%d)
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* @param int $num_items the total number of items, posts, etc., used to determine the number of pages to produce
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* @param int $per_page the number of items, posts, etc. to display per page, used to determine the number of pages to produce
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* @param int $start the item which should be considered currently active, used to determine the page we're on
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* @param bool $reverse_count determines whether we weight display of the list towards the start (false) or end (true) of the list
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* @param bool $ignore_on_page decides whether we enable an active (unlinked) item, used primarily for embedded lists
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* @return null
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*/
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public function generate_template_pagination($base_url, $block_var_name, $start_name, $num_items, $per_page, $start = 1, $reverse_count = false, $ignore_on_page = false)
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{
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$total_pages = ceil($num_items / $per_page);
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$on_page = $this->get_on_page($per_page, $start);
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$u_previous_page = $u_next_page = '';
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if ($total_pages > 1)
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{
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if ($reverse_count)
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{
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$start_page = ($total_pages > 5) ? $total_pages - 4 : 1;
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$end_page = $total_pages;
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}
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else
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{
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// What we're doing here is calculating what the "start" and "end" pages should be. We
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// do this by assuming pagination is "centered" around the currently active page with
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// the three previous and three next page links displayed. Anything more than that and
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// we display the ellipsis, likewise anything less.
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//
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// $start_page is the page at which we start creating the list. When we have five or less
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// pages we start at page 1 since there will be no ellipsis displayed. Anymore than that
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// and we calculate the start based on the active page. This is the min/max calculation.
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// First (max) would we end up starting on a page less than 1? Next (min) would we end
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// up starting so close to the end that we'd not display our minimum number of pages.
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//
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// $end_page is the last page in the list to display. Like $start_page we use a min/max to
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// determine this number. Again at most five pages? Then just display them all. More than
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// five and we first (min) determine whether we'd end up listing more pages than exist.
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// We then (max) ensure we're displaying the minimum number of pages.
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$start_page = ($total_pages > 5) ? min(max(1, $on_page - 3), $total_pages - 4) : 1;
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$end_page = ($total_pages > 5) ? max(min($total_pages, $on_page + 3), 5) : $total_pages;
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}
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if ($on_page != 1)
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{
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$u_previous_page = $this->generate_page_link($base_url, $on_page - 1, $start_name, $per_page);
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$this->template->assign_block_vars($block_var_name, array(
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'PAGE_NUMBER' => '',
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'PAGE_URL' => $u_previous_page,
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'S_IS_CURRENT' => false,
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'S_IS_PREV' => true,
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'S_IS_NEXT' => false,
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'S_IS_ELLIPSIS' => false,
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));
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}
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// This do...while exists purely to negate the need for start and end assign_block_vars, i.e.
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// to display the first and last page in the list plus any ellipsis. We use this loop to jump
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// around a little within the list depending on where we're starting (and ending).
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$at_page = 1;
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do
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{
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// We decide whether to display the ellipsis during the loop. The ellipsis is always
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// displayed as either the second or penultimate item in the list. So are we at either
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// of those points and of course do we even need to display it, i.e. is the list starting
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// on at least page 3 and ending three pages before the final item.
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$this->template->assign_block_vars($block_var_name, array(
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'PAGE_NUMBER' => $at_page,
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'PAGE_URL' => $this->generate_page_link($base_url, $at_page, $start_name, $per_page),
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'S_IS_CURRENT' => (!$ignore_on_page && $at_page == $on_page),
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'S_IS_NEXT' => false,
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'S_IS_PREV' => false,
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'S_IS_ELLIPSIS' => ($at_page == 2 && $start_page > 2) || ($at_page == $total_pages - 1 && $end_page < $total_pages - 1),
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));
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// We may need to jump around in the list depending on whether we have or need to display
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// the ellipsis. Are we on page 2 and are we more than one page away from the start
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// of the list? Yes? Then we jump to the start of the list. Likewise are we at the end of
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// the list and are there more than two pages left in total? Yes? Then jump to the penultimate
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// page (so we can display the ellipsis next pass). Else, increment the counter and keep
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// going
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if ($at_page == 2 && $at_page < $start_page - 1)
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{
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$at_page = $start_page;
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}
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else if ($at_page == $end_page && $end_page < $total_pages - 1)
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{
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$at_page = $total_pages - 1;
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}
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else
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{
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$at_page++;
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}
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}
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while ($at_page <= $total_pages);
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if ($on_page != $total_pages)
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{
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$u_next_page = $this->generate_page_link($base_url, $on_page + 1, $start_name, $per_page);
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$this->template->assign_block_vars($block_var_name, array(
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'PAGE_NUMBER' => '',
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'PAGE_URL' => $u_next_page,
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'S_IS_CURRENT' => false,
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'S_IS_PREV' => false,
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'S_IS_NEXT' => true,
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'S_IS_ELLIPSIS' => false,
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));
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}
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}
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// If the block_var_name is a nested block, we will use the last (most
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// inner) block as a prefix for the template variables. If the last block
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// name is pagination, the prefix is empty. If the rest of the
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// block_var_name is not empty, we will modify the last row of that block
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// and add our pagination items.
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$tpl_block_name = $tpl_prefix = '';
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if (strrpos($block_var_name, '.') !== false)
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{
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$tpl_block_name = substr($block_var_name, 0, strrpos($block_var_name, '.'));
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$tpl_prefix = strtoupper(substr($block_var_name, strrpos($block_var_name, '.') + 1));
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}
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else
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{
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$tpl_prefix = strtoupper($block_var_name);
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}
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$tpl_prefix = ($tpl_prefix == 'PAGINATION') ? '' : $tpl_prefix . '_';
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$template_array = array(
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$tpl_prefix . 'BASE_URL' => is_string($base_url) ? $base_url : '',//@todo: Fix this for routes
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$tpl_prefix . 'START_NAME' => $start_name,
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$tpl_prefix . 'PER_PAGE' => $per_page,
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'U_' . $tpl_prefix . 'PREVIOUS_PAGE' => ($on_page != 1) ? $u_previous_page : '',
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'U_' . $tpl_prefix . 'NEXT_PAGE' => ($on_page != $total_pages) ? $u_next_page : '',
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$tpl_prefix . 'TOTAL_PAGES' => $total_pages,
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$tpl_prefix . 'CURRENT_PAGE' => $on_page,
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$tpl_prefix . 'PAGE_NUMBER' => $this->on_page($num_items, $per_page, $start),
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);
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if ($tpl_block_name)
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{
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$this->template->alter_block_array($tpl_block_name, $template_array, true, 'change');
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}
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else
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{
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$this->template->assign_vars($template_array);
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}
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}
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/**
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* Get current page number
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*
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* @param int $per_page the number of items, posts, etc. per page
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* @param int $start the item which should be considered currently active, used to determine the page we're on
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* @return int Current page number
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*/
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public function get_on_page($per_page, $start)
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{
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return floor($start / $per_page) + 1;
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}
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/**
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* Return current page
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*
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* @param int $num_items the total number of items, posts, topics, etc.
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* @param int $per_page the number of items, posts, etc. per page
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* @param int $start the item which should be considered currently active, used to determine the page we're on
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* @return string Descriptive pagination string (e.g. "page 1 of 10")
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*/
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public function on_page($num_items, $per_page, $start)
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{
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$on_page = $this->get_on_page($per_page, $start);
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return $this->user->lang('PAGE_OF', $on_page, max(ceil($num_items / $per_page), 1));
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}
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/**
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* Get current page number
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*
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* @param int $start the item which should be considered currently active, used to determine the page we're on
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* @param int $per_page the number of items, posts, etc. per page
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* @param int $num_items the total number of items, posts, topics, etc.
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* @return int Current page number
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*/
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public function validate_start($start, $per_page, $num_items)
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{
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if ($start < 0 || $start >= $num_items)
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{
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return ($start < 0 || $num_items <= 0) ? 0 : floor(($num_items - 1) / $per_page) * $per_page;
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}
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return $start;
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}
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/**
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* Get new start when searching from the end
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*
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* If the user is trying to reach late pages, start searching from the end.
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*
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* @param int $start the item which should be considered currently active, used to determine the page we're on
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* @param int $limit the number of items, posts, etc. to display
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* @param int $num_items the total number of items, posts, topics, etc.
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* @return int Current page number
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*/
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public function reverse_start($start, $limit, $num_items)
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{
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return max(0, $num_items - $limit - $start);
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}
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/**
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* Get new item limit when searching from the end
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*
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* If the user is trying to reach late pages, start searching from the end.
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* In this case the items to display might be lower then the actual per_page setting.
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*
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* @param int $start the item which should be considered currently active, used to determine the page we're on
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* @param int $per_page the number of items, posts, etc. per page
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* @param int $num_items the total number of items, posts, topics, etc.
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* @return int Current page number
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*/
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public function reverse_limit($start, $per_page, $num_items)
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{
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if ($start + $per_page > $num_items)
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{
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return min($per_page, max(1, $num_items - $start));
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}
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return $per_page;
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}
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}
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