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- <?php
- // $Id: pager.inc,v 1.63 2007/12/06 09:58:30 goba Exp $
-
- /**
- * @file
- * Functions to aid in presenting database results as a set of pages.
- */
-
- /**
- * Perform a paged database query.
- *
- * Use this function when doing select queries you wish to be able to page. The
- * pager uses LIMIT-based queries to fetch only the records required to render a
- * certain page. However, it has to learn the total number of records returned
- * by the query to compute the number of pages (the number of records / records
- * per page). This is done by inserting "COUNT(*)" in the original query. For
- * example, the query "SELECT nid, type FROM node WHERE status = '1' ORDER BY
- * sticky DESC, created DESC" would be rewritten to read "SELECT COUNT(*) FROM
- * node WHERE status = '1' ORDER BY sticky DESC, created DESC". Rewriting the
- * query is accomplished using a regular expression.
- *
- * Unfortunately, the rewrite rule does not always work as intended for queries
- * that already have a "COUNT(*)" or a "GROUP BY" clause, and possibly for
- * other complex queries. In those cases, you can optionally pass a query that
- * will be used to count the records.
- *
- * For example, if you want to page the query "SELECT COUNT(*), TYPE FROM node
- * GROUP BY TYPE", pager_query() would invoke the incorrect query "SELECT
- * COUNT(*) FROM node GROUP BY TYPE". So instead, you should pass "SELECT
- * COUNT(DISTINCT(TYPE)) FROM node" as the optional $count_query parameter.
- *
- * @param $query
- * The SQL query that needs paging.
- * @param $limit
- * The number of query results to display per page.
- * @param $element
- * An optional integer to distinguish between multiple pagers on one page.
- * @param $count_query
- * An SQL query used to count matching records.
- * @param ...
- * A variable number of arguments which are substituted into the query (and
- * the count query) using printf() syntax. Instead of a variable number of
- * query arguments, you may also pass a single array containing the query
- * arguments.
- * @return
- * A database query result resource, or FALSE if the query was not executed
- * correctly.
- *
- * @ingroup database
- */
- function pager_query($query, $limit = 10, $element = 0, $count_query = NULL) {
- global $pager_page_array, $pager_total, $pager_total_items;
- $page = isset($_GET['page']) ? $_GET['page'] : '';
-
- // Substitute in query arguments.
- $args = func_get_args();
- $args = array_slice($args, 4);
- // Alternative syntax for '...'
- if (isset($args[0]) && is_array($args[0])) {
- $args = $args[0];
- }
-
- // Construct a count query if none was given.
- if (!isset($count_query)) {
- $count_query = preg_replace(array('/SELECT.*?FROM /As', '/ORDER BY .*/'), array('SELECT COUNT(*) FROM ', ''), $query);
- }
-
- // Convert comma-separated $page to an array, used by other functions.
- $pager_page_array = explode(',', $page);
-
- // We calculate the total of pages as ceil(items / limit).
- $pager_total_items[$element] = db_result(db_query($count_query, $args));
- $pager_total[$element] = ceil($pager_total_items[$element] / $limit);
- $pager_page_array[$element] = max(0, min((int)$pager_page_array[$element], ((int)$pager_total[$element]) - 1));
- return db_query_range($query, $args, $pager_page_array[$element] * $limit, $limit);
- }
-
- /**
- * Compose a query string to append to pager requests.
- *
- * @return
- * A query string that consists of all components of the current page request
- * except for those pertaining to paging.
- */
- function pager_get_querystring() {
- static $string = NULL;
- if (!isset($string)) {
- $string = drupal_query_string_encode($_REQUEST, array_merge(array('q', 'page'), array_keys($_COOKIE)));
- }
- return $string;
- }
-
- /**
- * Format a query pager.
- *
- * Menu callbacks that display paged query results should call theme('pager') to
- * retrieve a pager control so that users can view other results.
- * Format a list of nearby pages with additional query results.
- *
- * @param $tags
- * An array of labels for the controls in the pager.
- * @param $limit
- * The number of query results to display per page.
- * @param $element
- * An optional integer to distinguish between multiple pagers on one page.
- * @param $parameters
- * An associative array of query string parameters to append to the pager links.
- * @param $quantity
- * The number of pages in the list.
- * @return
- * An HTML string that generates the query pager.
- *
- * @ingroup themeable
- */
- function theme_pager($tags = array(), $limit = 10, $element = 0, $parameters = array(), $quantity = 9) {
- global $pager_page_array, $pager_total;
-
- // Calculate various markers within this pager piece:
- // Middle is used to "center" pages around the current page.
- $pager_middle = ceil($quantity / 2);
- // current is the page we are currently paged to
- $pager_current = $pager_page_array[$element] + 1;
- // first is the first page listed by this pager piece (re quantity)
- $pager_first = $pager_current - $pager_middle + 1;
- // last is the last page listed by this pager piece (re quantity)
- $pager_last = $pager_current + $quantity - $pager_middle;
- // max is the maximum page number
- $pager_max = $pager_total[$element];
- // End of marker calculations.
-
- // Prepare for generation loop.
- $i = $pager_first;
- if ($pager_last > $pager_max) {
- // Adjust "center" if at end of query.
- $i = $i + ($pager_max - $pager_last);
- $pager_last = $pager_max;
- }
- if ($i <= 0) {
- // Adjust "center" if at start of query.
- $pager_last = $pager_last + (1 - $i);
- $i = 1;
- }
- // End of generation loop preparation.
-
- $li_first = theme('pager_first', (isset($tags[0]) ? $tags[0] : t('« first')), $limit, $element, $parameters);
- $li_previous = theme('pager_previous', (isset($tags[1]) ? $tags[1] : t('‹ previous')), $limit, $element, 1, $parameters);
- $li_next = theme('pager_next', (isset($tags[3]) ? $tags[3] : t('next ›')), $limit, $element, 1, $parameters);
- $li_last = theme('pager_last', (isset($tags[4]) ? $tags[4] : t('last ┬╗')), $limit, $element, $parameters);
-
- if ($pager_total[$element] > 1) {
- if ($li_first) {
- $items[] = array(
- 'class' => 'pager-first',
- 'data' => $li_first,
- );
- }
- if ($li_previous) {
- $items[] = array(
- 'class' => 'pager-previous',
- 'data' => $li_previous,
- );
- }
-
- // When there is more than one page, create the pager list.
- if ($i != $pager_max) {
- if ($i > 1) {
- $items[] = array(
- 'class' => 'pager-ellipsis',
- 'data' => '…',
- );
- }
- // Now generate the actual pager piece.
- for (; $i <= $pager_last && $i <= $pager_max; $i++) {
- if ($i < $pager_current) {
- $items[] = array(
- 'class' => 'pager-item',
- 'data' => theme('pager_previous', $i, $limit, $element, ($pager_current - $i), $parameters),
- );
- }
- if ($i == $pager_current) {
- $items[] = array(
- 'class' => 'pager-current',
- 'data' => $i,
- );
- }
- if ($i > $pager_current) {
- $items[] = array(
- 'class' => 'pager-item',
- 'data' => theme('pager_next', $i, $limit, $element, ($i - $pager_current), $parameters),
- );
- }
- }
- if ($i < $pager_max) {
- $items[] = array(
- 'class' => 'pager-ellipsis',
- 'data' => '…',
- );
- }
- }
- // End generation.
- if ($li_next) {
- $items[] = array(
- 'class' => 'pager-next',
- 'data' => $li_next,
- );
- }
- if ($li_last) {
- $items[] = array(
- 'class' => 'pager-last',
- 'data' => $li_last,
- );
- }
- return theme('item_list', $items, NULL, 'ul', array('class' => 'pager'));
- }
- }
-
-
- /**
- * @name Pager pieces
- * @{
- * Use these pieces to construct your own custom pagers in your theme. Note that
- * you should NOT modify this file to customize your pager.
- */
-
- /**
- * Format a "first page" link.
- *
- * @param $text
- * The name (or image) of the link.
- * @param $limit
- * The number of query results to display per page.
- * @param $element
- * An optional integer to distinguish between multiple pagers on one page.
- * @param $parameters
- * An associative array of query string parameters to append to the pager links.
- * @return
- * An HTML string that generates this piece of the query pager.
- *
- * @ingroup themeable
- */
- function theme_pager_first($text, $limit, $element = 0, $parameters = array()) {
- global $pager_page_array;
- $output = '';
-
- // If we are anywhere but the first page
- if ($pager_page_array[$element] > 0) {
- $output = theme('pager_link', $text, pager_load_array(0, $element, $pager_page_array), $element, $parameters);
- }
-
- return $output;
- }
-
- /**
- * Format a "previous page" link.
- *
- * @param $text
- * The name (or image) of the link.
- * @param $limit
- * The number of query results to display per page.
- * @param $element
- * An optional integer to distinguish between multiple pagers on one page.
- * @param $interval
- * The number of pages to move backward when the link is clicked.
- * @param $parameters
- * An associative array of query string parameters to append to the pager links.
- * @return
- * An HTML string that generates this piece of the query pager.
- *
- * @ingroup themeable
- */
- function theme_pager_previous($text, $limit, $element = 0, $interval = 1, $parameters = array()) {
- global $pager_page_array;
- $output = '';
-
- // If we are anywhere but the first page
- if ($pager_page_array[$element] > 0) {
- $page_new = pager_load_array($pager_page_array[$element] - $interval, $element, $pager_page_array);
-
- // If the previous page is the first page, mark the link as such.
- if ($page_new[$element] == 0) {
- $output = theme('pager_first', $text, $limit, $element, $parameters);
- }
- // The previous page is not the first page.
- else {
- $output = theme('pager_link', $text, $page_new, $element, $parameters);
- }
- }
-
- return $output;
- }
-
- /**
- * Format a "next page" link.
- *
- * @param $text
- * The name (or image) of the link.
- * @param $limit
- * The number of query results to display per page.
- * @param $element
- * An optional integer to distinguish between multiple pagers on one page.
- * @param $interval
- * The number of pages to move forward when the link is clicked.
- * @param $parameters
- * An associative array of query string parameters to append to the pager links.
- * @return
- * An HTML string that generates this piece of the query pager.
- *
- * @ingroup themeable
- */
- function theme_pager_next($text, $limit, $element = 0, $interval = 1, $parameters = array()) {
- global $pager_page_array, $pager_total;
- $output = '';
-
- // If we are anywhere but the last page
- if ($pager_page_array[$element] < ($pager_total[$element] - 1)) {
- $page_new = pager_load_array($pager_page_array[$element] + $interval, $element, $pager_page_array);
- // If the next page is the last page, mark the link as such.
- if ($page_new[$element] == ($pager_total[$element] - 1)) {
- $output = theme('pager_last', $text, $limit, $element, $parameters);
- }
- // The next page is not the last page.
- else {
- $output = theme('pager_link', $text, $page_new, $element, $parameters);
- }
- }
-
- return $output;
- }
-
- /**
- * Format a "last page" link.
- *
- * @param $text
- * The name (or image) of the link.
- * @param $limit
- * The number of query results to display per page.
- * @param $element
- * An optional integer to distinguish between multiple pagers on one page.
- * @param $parameters
- * An associative array of query string parameters to append to the pager links.
- * @return
- * An HTML string that generates this piece of the query pager.
- *
- * @ingroup themeable
- */
- function theme_pager_last($text, $limit, $element = 0, $parameters = array()) {
- global $pager_page_array, $pager_total;
- $output = '';
-
- // If we are anywhere but the last page
- if ($pager_page_array[$element] < ($pager_total[$element] - 1)) {
- $output = theme('pager_link', $text, pager_load_array($pager_total[$element] - 1, $element, $pager_page_array), $element, $parameters);
- }
-
- return $output;
- }
-
-
- /**
- * Format a link to a specific query result page.
- *
- * @param $page_new
- * The first result to display on the linked page.
- * @param $element
- * An optional integer to distinguish between multiple pagers on one page.
- * @param $parameters
- * An associative array of query string parameters to append to the pager link.
- * @param $attributes
- * An associative array of HTML attributes to apply to a pager anchor tag.
- * @return
- * An HTML string that generates the link.
- *
- * @ingroup themeable
- */
- function theme_pager_link($text, $page_new, $element, $parameters = array(), $attributes = array()) {
- $page = isset($_GET['page']) ? $_GET['page'] : '';
- if ($new_page = implode(',', pager_load_array($page_new[$element], $element, explode(',', $page)))) {
- $parameters['page'] = $new_page;
- }
-
- $query = array();
- if (count($parameters)) {
- $query[] = drupal_query_string_encode($parameters, array());
- }
- $querystring = pager_get_querystring();
- if ($querystring != '') {
- $query[] = $querystring;
- }
-
- // Set each pager link title
- if (!isset($attributes['title'])) {
- static $titles = NULL;
- if (!isset($titles)) {
- $titles = array(
- t('« first') => t('Go to first page'),
- t('‹ previous') => t('Go to previous page'),
- t('next ›') => t('Go to next page'),
- t('last ┬╗') => t('Go to last page'),
- );
- }
- if (isset($titles[$text])) {
- $attributes['title'] = $titles[$text];
- }
- else if (is_numeric($text)) {
- $attributes['title'] = t('Go to page @number', array('@number' => $text));
- }
- }
-
- return l($text, $_GET['q'], array('attributes' => $attributes, 'query' => count($query) ? implode('&', $query) : NULL));
- }
-
- /**
- * @} End of "Pager pieces".
- */
-
- /**
- * Helper function
- *
- * Copies $old_array to $new_array and sets $new_array[$element] = $value
- * Fills in $new_array[0 .. $element - 1] = 0
- */
- function pager_load_array($value, $element, $old_array) {
- $new_array = $old_array;
- // Look for empty elements.
- for ($i = 0; $i < $element; $i++) {
- if (!$new_array[$i]) {
- // Load found empty element with 0.
- $new_array[$i] = 0;
- }
- }
- // Update the changed element.
- $new_array[$element] = (int)$value;
- return $new_array;
- }
-