Verzeichnisstruktur phpBB-3.1.0
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- 27.10.2014
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pagination.php
001 <?php
002 /**
003 *
004 * This file is part of the phpBB Forum Software package.
005 *
006 * @copyright (c) phpBB Limited <https://www.phpbb.com>
007 * @license GNU General Public License, version 2 (GPL-2.0)
008 *
009 * For full copyright and license information, please see
010 * the docs/CREDITS.txt file.
011 *
012 */
013
014 namespace phpbb;
015
016 class pagination
017 {
018 /** @var \phpbb\template\template */
019 protected $template;
020
021 /** @var \phpbb\user */
022 protected $user;
023
024 /** @var \phpbb\controller\helper */
025 protected $helper;
026
027 /** @var \phpbb\event\dispatcher_interface */
028 protected $phpbb_dispatcher;
029
030 /**
031 * Constructor
032 *
033 * @param \phpbb\template\template $template
034 * @param \phpbb\user $user
035 * @param \phpbb\controller\helper $helper
036 * @param \phpbb\event\dispatcher_interface $phpbb_dispatcher
037 */
038 public function __construct(\phpbb\template\template $template, \phpbb\user $user, \phpbb\controller\helper $helper, \phpbb\event\dispatcher_interface $phpbb_dispatcher)
039 {
040 $this->template = $template;
041 $this->user = $user;
042 $this->helper = $helper;
043 $this->phpbb_dispatcher = $phpbb_dispatcher;
044 }
045
046 /**
047 * Generate a pagination link based on the url and the page information
048 *
049 * @param string $base_url is url prepended to all links generated within the function
050 * If you use page numbers inside your controller route, base_url should contains a placeholder (%d)
051 * for the page. Also be sure to specify the pagination path information into the start_name argument
052 * @param string $on_page is the page for which we want to generate the link
053 * @param string $start_name is the name of the parameter containing the first item of the given page (example: start=20)
054 * If you use page numbers inside your controller route, start name should be the string
055 * that should be removed for the first page (example: /page/%d)
056 * @param int $per_page the number of items, posts, etc. to display per page, used to determine the number of pages to produce
057 * @return string URL for the requested page
058 */
059 protected function generate_page_link($base_url, $on_page, $start_name, $per_page)
060 {
061 // A listener can set this variable to the new pagination URL
062 // to override the generate_page_link() function generated value
063 $generate_page_link_override = false;
064
065 /**
066 * Execute code and/or override generate_page_link()
067 *
068 * To override the generate_page_link() function generated value
069 * set $generate_page_link_override to the new URL value
070 *
071 * @event core.pagination_generate_page_link
072 * @var string base_url is url prepended to all links generated within the function
073 * If you use page numbers inside your controller route, base_url should contains a placeholder (%d)
074 * for the page. Also be sure to specify the pagination path information into the start_name argument
075 * @var string on_page is the page for which we want to generate the link
076 * @var string start_name is the name of the parameter containing the first item of the given page (example: start=20)
077 * If you use page numbers inside your controller route, start name should be the string
078 * that should be removed for the first page (example: /page/%d)
079 * @var int per_page the number of items, posts, etc. to display per page, used to determine the number of pages to produce
080 * @var bool|string generate_page_link_override Shall we return custom pagination link (string URL) or not (false)
081 * @since 3.1.0-RC5
082 */
083 $vars = array('base_url', 'on_page', 'start_name', 'per_page', 'generate_page_link_override');
084 extract($this->phpbb_dispatcher->trigger_event('core.pagination_generate_page_link', compact($vars)));
085
086 if ($generate_page_link_override)
087 {
088 return $generate_page_link_override;
089 }
090
091 if (!is_string($base_url))
092 {
093 if (is_array($base_url['routes']))
094 {
095 $route = ($on_page > 1) ? $base_url['routes'][1] : $base_url['routes'][0];
096 }
097 else
098 {
099 $route = $base_url['routes'];
100 }
101 $params = (isset($base_url['params'])) ? $base_url['params'] : array();
102 $is_amp = (isset($base_url['is_amp'])) ? $base_url['is_amp'] : true;
103 $session_id = (isset($base_url['session_id'])) ? $base_url['session_id'] : false;
104
105 if ($on_page > 1 || !is_array($base_url['routes']))
106 {
107 $params[$start_name] = (int) $on_page;
108 }
109
110 return $this->helper->route($route, $params, $is_amp, $session_id);
111 }
112 else
113 {
114 $url_delim = (strpos($base_url, '?') === false) ? '?' : ((strpos($base_url, '?') === strlen($base_url) - 1) ? '' : '&');
115 return ($on_page > 1) ? $base_url . $url_delim . $start_name . '=' . (($on_page - 1) * $per_page) : $base_url;
116 }
117 }
118
119 /**
120 * Generate template rendered pagination
121 * Allows full control of rendering of pagination with the template
122 *
123 * @param string $base_url is url prepended to all links generated within the function
124 * If you use page numbers inside your controller route, base_url should contains a placeholder (%d)
125 * for the page. Also be sure to specify the pagination path information into the start_name argument
126 * @param string $block_var_name is the name assigned to the pagination data block within the template (example: <!-- BEGIN pagination -->)
127 * @param string $start_name is the name of the parameter containing the first item of the given page (example: start=20)
128 * If you use page numbers inside your controller route, start name should be the string
129 * that should be removed for the first page (example: /page/%d)
130 * @param int $num_items the total number of items, posts, etc., used to determine the number of pages to produce
131 * @param int $per_page the number of items, posts, etc. to display per page, used to determine the number of pages to produce
132 * @param int $start the item which should be considered currently active, used to determine the page we're on
133 * @param bool $reverse_count determines whether we weight display of the list towards the start (false) or end (true) of the list
134 * @param bool $ignore_on_page decides whether we enable an active (unlinked) item, used primarily for embedded lists
135 * @return null
136 */
137 public function generate_template_pagination($base_url, $block_var_name, $start_name, $num_items, $per_page, $start = 1, $reverse_count = false, $ignore_on_page = false)
138 {
139 $total_pages = ceil($num_items / $per_page);
140 $on_page = $this->get_on_page($per_page, $start);
141 $u_previous_page = $u_next_page = '';
142
143 if ($total_pages > 1)
144 {
145 if ($reverse_count)
146 {
147 $start_page = ($total_pages > 5) ? $total_pages - 4 : 1;
148 $end_page = $total_pages;
149 }
150 else
151 {
152 // What we're doing here is calculating what the "start" and "end" pages should be. We
153 // do this by assuming pagination is "centered" around the currently active page with
154 // the three previous and three next page links displayed. Anything more than that and
155 // we display the ellipsis, likewise anything less.
156 //
157 // $start_page is the page at which we start creating the list. When we have five or less
158 // pages we start at page 1 since there will be no ellipsis displayed. Anymore than that
159 // and we calculate the start based on the active page. This is the min/max calculation.
160 // First (max) would we end up starting on a page less than 1? Next (min) would we end
161 // up starting so close to the end that we'd not display our minimum number of pages.
162 //
163 // $end_page is the last page in the list to display. Like $start_page we use a min/max to
164 // determine this number. Again at most five pages? Then just display them all. More than
165 // five and we first (min) determine whether we'd end up listing more pages than exist.
166 // We then (max) ensure we're displaying the minimum number of pages.
167 $start_page = ($total_pages > 5) ? min(max(1, $on_page - 2), $total_pages - 4) : 1;
168 $end_page = ($total_pages > 5) ? max(min($total_pages, $on_page + 2), 5) : $total_pages;
169 }
170
171 if ($on_page != 1)
172 {
173 $u_previous_page = $this->generate_page_link($base_url, $on_page - 1, $start_name, $per_page);
174
175 $this->template->assign_block_vars($block_var_name, array(
176 'PAGE_NUMBER' => '',
177 'PAGE_URL' => $u_previous_page,
178 'S_IS_CURRENT' => false,
179 'S_IS_PREV' => true,
180 'S_IS_NEXT' => false,
181 'S_IS_ELLIPSIS' => false,
182 ));
183 }
184
185 // This do...while exists purely to negate the need for start and end assign_block_vars, i.e.
186 // to display the first and last page in the list plus any ellipsis. We use this loop to jump
187 // around a little within the list depending on where we're starting (and ending).
188 $at_page = 1;
189 do
190 {
191 // We decide whether to display the ellipsis during the loop. The ellipsis is always
192 // displayed as either the second or penultimate item in the list. So are we at either
193 // of those points and of course do we even need to display it, i.e. is the list starting
194 // on at least page 3 and ending three pages before the final item.
195 $this->template->assign_block_vars($block_var_name, array(
196 'PAGE_NUMBER' => $at_page,
197 'PAGE_URL' => $this->generate_page_link($base_url, $at_page, $start_name, $per_page),
198 'S_IS_CURRENT' => (!$ignore_on_page && $at_page == $on_page),
199 'S_IS_NEXT' => false,
200 'S_IS_PREV' => false,
201 'S_IS_ELLIPSIS' => ($at_page == 2 && $start_page > 2) || ($at_page == $total_pages - 1 && $end_page < $total_pages - 1),
202 ));
203
204 // We may need to jump around in the list depending on whether we have or need to display
205 // the ellipsis. Are we on page 2 and are we more than one page away from the start
206 // of the list? Yes? Then we jump to the start of the list. Likewise are we at the end of
207 // the list and are there more than two pages left in total? Yes? Then jump to the penultimate
208 // page (so we can display the ellipsis next pass). Else, increment the counter and keep
209 // going
210 if ($at_page == 2 && $at_page < $start_page - 1)
211 {
212 $at_page = $start_page;
213 }
214 else if ($at_page == $end_page && $end_page < $total_pages - 1)
215 {
216 $at_page = $total_pages - 1;
217 }
218 else
219 {
220 $at_page++;
221 }
222 }
223 while ($at_page <= $total_pages);
224
225 if ($on_page != $total_pages)
226 {
227 $u_next_page = $this->generate_page_link($base_url, $on_page + 1, $start_name, $per_page);
228
229 $this->template->assign_block_vars($block_var_name, array(
230 'PAGE_NUMBER' => '',
231 'PAGE_URL' => $u_next_page,
232 'S_IS_CURRENT' => false,
233 'S_IS_PREV' => false,
234 'S_IS_NEXT' => true,
235 'S_IS_ELLIPSIS' => false,
236 ));
237 }
238 }
239
240 // If the block_var_name is a nested block, we will use the last (most
241 // inner) block as a prefix for the template variables. If the last block
242 // name is pagination, the prefix is empty. If the rest of the
243 // block_var_name is not empty, we will modify the last row of that block
244 // and add our pagination items.
245 $tpl_block_name = $tpl_prefix = '';
246 if (strrpos($block_var_name, '.') !== false)
247 {
248 $tpl_block_name = substr($block_var_name, 0, strrpos($block_var_name, '.'));
249 $tpl_prefix = strtoupper(substr($block_var_name, strrpos($block_var_name, '.') + 1));
250 }
251 else
252 {
253 $tpl_prefix = strtoupper($block_var_name);
254 }
255 $tpl_prefix = ($tpl_prefix == 'PAGINATION') ? '' : $tpl_prefix . '_';
256
257 $template_array = array(
258 $tpl_prefix . 'BASE_URL' => is_string($base_url) ? $base_url : '',//@todo: Fix this for routes
259 $tpl_prefix . 'START_NAME' => $start_name,
260 $tpl_prefix . 'PER_PAGE' => $per_page,
261 'U_' . $tpl_prefix . 'PREVIOUS_PAGE' => ($on_page != 1) ? $u_previous_page : '',
262 'U_' . $tpl_prefix . 'NEXT_PAGE' => ($on_page != $total_pages) ? $u_next_page : '',
263 $tpl_prefix . 'TOTAL_PAGES' => $total_pages,
264 $tpl_prefix . 'CURRENT_PAGE' => $on_page,
265 $tpl_prefix . 'PAGE_NUMBER' => $this->on_page($num_items, $per_page, $start),
266 );
267
268 if ($tpl_block_name)
269 {
270 $this->template->alter_block_array($tpl_block_name, $template_array, true, 'change');
271 }
272 else
273 {
274 $this->template->assign_vars($template_array);
275 }
276 }
277
278 /**
279 * Get current page number
280 *
281 * @param int $per_page the number of items, posts, etc. per page
282 * @param int $start the item which should be considered currently active, used to determine the page we're on
283 * @return int Current page number
284 */
285 public function get_on_page($per_page, $start)
286 {
287 return floor($start / $per_page) + 1;
288 }
289
290 /**
291 * Return current page
292 *
293 * @param int $num_items the total number of items, posts, topics, etc.
294 * @param int $per_page the number of items, posts, etc. per page
295 * @param int $start the item which should be considered currently active, used to determine the page we're on
296 * @return string Descriptive pagination string (e.g. "page 1 of 10")
297 */
298 public function on_page($num_items, $per_page, $start)
299 {
300 $on_page = $this->get_on_page($per_page, $start);
301 return $this->user->lang('PAGE_OF', $on_page, max(ceil($num_items / $per_page), 1));
302 }
303
304 /**
305 * Get current page number
306 *
307 * @param int $start the item which should be considered currently active, used to determine the page we're on
308 * @param int $per_page the number of items, posts, etc. per page
309 * @param int $num_items the total number of items, posts, topics, etc.
310 * @return int Current page number
311 */
312 public function validate_start($start, $per_page, $num_items)
313 {
314 if ($start < 0 || $start >= $num_items)
315 {
316 return ($start < 0 || $num_items <= 0) ? 0 : floor(($num_items - 1) / $per_page) * $per_page;
317 }
318
319 return $start;
320 }
321
322 /**
323 * Get new start when searching from the end
324 *
325 * If the user is trying to reach late pages, start searching from the end.
326 *
327 * @param int $start the item which should be considered currently active, used to determine the page we're on
328 * @param int $limit the number of items, posts, etc. to display
329 * @param int $num_items the total number of items, posts, topics, etc.
330 * @return int Current page number
331 */
332 public function reverse_start($start, $limit, $num_items)
333 {
334 return max(0, $num_items - $limit - $start);
335 }
336
337 /**
338 * Get new item limit when searching from the end
339 *
340 * If the user is trying to reach late pages, start searching from the end.
341 * In this case the items to display might be lower then the actual per_page setting.
342 *
343 * @param int $start the item which should be considered currently active, used to determine the page we're on
344 * @param int $per_page the number of items, posts, etc. per page
345 * @param int $num_items the total number of items, posts, topics, etc.
346 * @return int Current page number
347 */
348 public function reverse_limit($start, $per_page, $num_items)
349 {
350 if ($start + $per_page > $num_items)
351 {
352 return min($per_page, max(1, $num_items - $start));
353 }
354
355 return $per_page;
356 }
357 }
358