552 lines
17 KiB
PHP
552 lines
17 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* Functions to aid in presenting database results as a set of pages.
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*/
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/**
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* Query extender for pager queries.
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*
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* This is the "default" pager mechanism. It creates a paged query with a fixed
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* number of entries per page.
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*/
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class PagerDefault extends SelectQueryExtender {
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/**
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* The highest element we've autogenerated so far.
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*
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* @var int
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*/
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static protected $maxElement = 0;
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/**
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* The number of elements per page to allow.
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*
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* @var int
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*/
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protected $limit = 10;
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/**
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* The unique ID of this pager on this page.
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*
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* @var int
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*/
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protected $element = NULL;
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/**
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* The count query that will be used for this pager.
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*
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* @var SelectQueryInterface
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*/
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protected $customCountQuery = FALSE;
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public function __construct(SelectQueryInterface $query, DatabaseConnection $connection) {
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parent::__construct($query, $connection);
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// Add pager tag. Do this here to ensure that it is always added before
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// preExecute() is called.
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$this->addTag('pager');
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}
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/**
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* Override the execute method.
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*
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* Before we run the query, we need to add pager-based range() instructions
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* to it.
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*/
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public function execute() {
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global $pager_page_array, $pager_total, $pager_total_items, $pager_limits;
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// Add convenience tag to mark that this is an extended query. We have to
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// do this in the constructor to ensure that it is set before preExecute()
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// gets called.
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if (!$this->preExecute($this)) {
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return NULL;
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}
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// A NULL limit is the "kill switch" for pager queries.
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if (empty($this->limit)) {
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return;
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}
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$this->ensureElement();
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$page = isset($_GET['page']) ? $_GET['page'] : '';
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// Convert comma-separated $page to an array, used by other functions.
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$pager_page_array = explode(',', $page);
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if (!isset($pager_page_array[$this->element])) {
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$pager_page_array[$this->element] = 0;
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}
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// We calculate the total of pages as ceil(items / limit).
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$pager_total_items[$this->element] = $this->getCountQuery()->execute()->fetchField();
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$pager_total[$this->element] = ceil($pager_total_items[$this->element] / $this->limit);
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$pager_page_array[$this->element] = max(0, min((int)$pager_page_array[$this->element], ((int)$pager_total[$this->element]) - 1));
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$pager_limits[$this->element] = $this->limit;
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$this->range($pager_page_array[$this->element] * $this->limit, $this->limit);
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// Now that we've added our pager-based range instructions, run the query normally.
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return $this->query->execute();
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}
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/**
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* Ensure that there is an element associated with this query.
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*
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* After running this query, access $this->element to get the element for this
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* query.
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*/
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protected function ensureElement() {
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if (!empty($this->element)) {
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return;
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}
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$this->element = self::$maxElement++;
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}
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/**
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* Specify the count query object to use for this pager.
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*
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* You will rarely need to specify a count query directly. If not specified,
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* one is generated off of the pager query itself.
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*
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* @param SelectQueryInterface $query
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* The count query object. It must return a single row with a single column,
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* which is the total number of records.
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*/
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public function setCountQuery(SelectQueryInterface $query) {
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$this->customCountQuery = $query;
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}
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/**
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* Retrieve the count query for this pager.
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*
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* The count query may be specified manually or, by default, taken from the
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* query we are extending.
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*
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* @return
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* A count SelectQueryInterface object.
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*/
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protected function getCountQuery() {
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if ($this->customCountQuery) {
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return $this->customCountQuery;
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}
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else {
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return $this->query->countQuery();
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}
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}
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/**
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* Specify the maximum number of elements per page for this query.
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*
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* The default if not specified is 10 items per page.
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*
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* @param $limit
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* An integer specifying the number of elements per page. If passed a false
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* value (FALSE, 0, NULL), the pager is disabled.
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*/
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public function limit($limit = 10) {
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$this->limit = $limit;
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return $this;
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}
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/**
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* Specify the element ID for this pager query.
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*
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* The element is used to differentiate different pager queries on the same
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* page so that they may be operated independently. If you do not specify an
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* element, every pager query on the page will get a unique element. If for
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* whatever reason you want to explicitly define an element for a given query,
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* you may do so here.
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*
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* @param $element
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*/
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public function element($element) {
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$this->element = $element;
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return $this;
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}
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}
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/**
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* Compose a URL query parameter array for pager links.
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*
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* @return
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* A URL query parameter array that consists of all components of the current
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* page request except for those pertaining to paging.
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*/
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function pager_get_query_parameters() {
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$query = &drupal_static(__FUNCTION__);
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if (!isset($query)) {
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$query = drupal_get_query_parameters($_REQUEST, array_merge(array('q', 'page'), array_keys($_COOKIE)));
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}
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return $query;
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}
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/**
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* Format a query pager.
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*
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* Menu callbacks that display paged query results should call theme('pager') to
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* retrieve a pager control so that users can view other results.
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* Format a list of nearby pages with additional query results.
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*
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* @param $variables
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* An associative array containing:
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* - tags: An array of labels for the controls in the pager.
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* - element: An optional integer to distinguish between multiple pagers on
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* one page.
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* - parameters: An associative array of query string parameters to append to
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* the pager links.
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* - quantity: The number of pages in the list.
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*
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* @return
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* An HTML string that generates the query pager.
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*
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* @ingroup themeable
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*/
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function theme_pager($variables) {
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$tags = $variables['tags'];
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$element = $variables['element'];
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$parameters = $variables['parameters'];
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$quantity = $variables['quantity'];
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global $pager_page_array, $pager_total;
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// Calculate various markers within this pager piece:
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// Middle is used to "center" pages around the current page.
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$pager_middle = ceil($quantity / 2);
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// current is the page we are currently paged to
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$pager_current = $pager_page_array[$element] + 1;
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// first is the first page listed by this pager piece (re quantity)
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$pager_first = $pager_current - $pager_middle + 1;
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// last is the last page listed by this pager piece (re quantity)
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$pager_last = $pager_current + $quantity - $pager_middle;
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// max is the maximum page number
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$pager_max = $pager_total[$element];
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// End of marker calculations.
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// Prepare for generation loop.
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$i = $pager_first;
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if ($pager_last > $pager_max) {
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// Adjust "center" if at end of query.
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$i = $i + ($pager_max - $pager_last);
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$pager_last = $pager_max;
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}
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if ($i <= 0) {
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// Adjust "center" if at start of query.
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$pager_last = $pager_last + (1 - $i);
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$i = 1;
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}
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// End of generation loop preparation.
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$li_first = theme('pager_first', array('text' => (isset($tags[0]) ? $tags[0] : t('« first')), 'element' => $element, 'parameters' => $parameters));
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$li_previous = theme('pager_previous', array('text' => (isset($tags[1]) ? $tags[1] : t('‹ previous')), 'element' => $element, 'interval' => 1, 'parameters' => $parameters));
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$li_next = theme('pager_next', array('text' => (isset($tags[3]) ? $tags[3] : t('next ›')), 'element' => $element, 'interval' => 1, 'parameters' => $parameters));
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$li_last = theme('pager_last', array('text' => (isset($tags[4]) ? $tags[4] : t('last »')), 'element' => $element, 'parameters' => $parameters));
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if ($pager_total[$element] > 1) {
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if ($li_first) {
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$items[] = array(
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'class' => array('pager-first'),
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'data' => $li_first,
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);
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}
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if ($li_previous) {
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$items[] = array(
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'class' => array('pager-previous'),
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'data' => $li_previous,
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);
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}
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// When there is more than one page, create the pager list.
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if ($i != $pager_max) {
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if ($i > 1) {
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$items[] = array(
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'class' => array('pager-ellipsis'),
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'data' => '…',
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);
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}
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// Now generate the actual pager piece.
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for (; $i <= $pager_last && $i <= $pager_max; $i++) {
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if ($i < $pager_current) {
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$items[] = array(
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'class' => array('pager-item'),
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'data' => theme('pager_previous', array('text' => $i, 'element' => $element, 'interval' => ($pager_current - $i), 'parameters' => $parameters)),
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);
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}
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if ($i == $pager_current) {
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$items[] = array(
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'class' => array('pager-current'),
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'data' => $i,
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);
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}
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if ($i > $pager_current) {
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$items[] = array(
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'class' => array('pager-item'),
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'data' => theme('pager_next', array('text' => $i, 'element' => $element, 'interval' => ($i - $pager_current), 'parameters' => $parameters)),
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);
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}
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}
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if ($i < $pager_max) {
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$items[] = array(
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'class' => array('pager-ellipsis'),
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'data' => '…',
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);
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}
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}
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// End generation.
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if ($li_next) {
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$items[] = array(
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'class' => array('pager-next'),
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'data' => $li_next,
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);
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}
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if ($li_last) {
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$items[] = array(
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'class' => array('pager-last'),
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'data' => $li_last,
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);
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}
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return '<h2 class="element-invisible">' . t('Pages') . '</h2>' . theme('item_list', array('items' => $items, 'title' => NULL, 'type' => 'ul', 'attributes' => array('class' => array('pager'))));
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}
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}
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/**
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* @name Pager pieces
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* @{
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* Use these pieces to construct your own custom pagers in your theme. Note that
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* you should NOT modify this file to customize your pager.
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*/
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/**
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* Format a "first page" link.
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*
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* @param $variables
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* An associative array containing:
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* - text: The name (or image) of the link.
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* - element: An optional integer to distinguish between multiple pagers on
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* one page.
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* - parameters: An associative array of query string parameters to append to
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* the pager links.
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*
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* @return
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* An HTML string that generates this piece of the query pager.
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*
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* @ingroup themeable
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*/
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function theme_pager_first($variables) {
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$text = $variables['text'];
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$element = $variables['element'];
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$parameters = $variables['parameters'];
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global $pager_page_array;
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$output = '';
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// If we are anywhere but the first page
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if ($pager_page_array[$element] > 0) {
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$output = theme('pager_link', array('text' => $text, 'page_new' => pager_load_array(0, $element, $pager_page_array), 'element' => $element, 'parameters' => $parameters));
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}
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return $output;
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}
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/**
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* Format a "previous page" link.
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*
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* @param $variables
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* An associative array containing:
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* - text: The name (or image) of the link.
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* - element: An optional integer to distinguish between multiple pagers on
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* one page.
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* - interval: The number of pages to move backward when the link is clicked.
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* - parameters: An associative array of query string parameters to append to
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* the pager links.
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*
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* @return
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* An HTML string that generates this piece of the query pager.
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*
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* @ingroup themeable
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*/
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function theme_pager_previous($variables) {
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$text = $variables['text'];
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$element = $variables['element'];
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$interval = $variables['interval'];
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$parameters = $variables['parameters'];
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global $pager_page_array;
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$output = '';
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// If we are anywhere but the first page
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if ($pager_page_array[$element] > 0) {
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$page_new = pager_load_array($pager_page_array[$element] - $interval, $element, $pager_page_array);
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// If the previous page is the first page, mark the link as such.
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if ($page_new[$element] == 0) {
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$output = theme('pager_first', array('text' => $text, 'element' => $element, 'parameters' => $parameters));
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}
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// The previous page is not the first page.
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else {
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$output = theme('pager_link', array('text' => $text, 'page_new' => $page_new, 'element' => $element, 'parameters' => $parameters));
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}
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}
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return $output;
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}
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/**
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* Format a "next page" link.
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*
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* @param $variables
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* An associative array containing:
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* - text: The name (or image) of the link.
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* - element: An optional integer to distinguish between multiple pagers on
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* one page.
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* - interval: The number of pages to move forward when the link is clicked.
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* - parameters: An associative array of query string parameters to append to
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* the pager links.
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*
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* @return
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* An HTML string that generates this piece of the query pager.
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*
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* @ingroup themeable
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*/
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function theme_pager_next($variables) {
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$text = $variables['text'];
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$element = $variables['element'];
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$interval = $variables['interval'];
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$parameters = $variables['parameters'];
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global $pager_page_array, $pager_total;
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$output = '';
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// If we are anywhere but the last page
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if ($pager_page_array[$element] < ($pager_total[$element] - 1)) {
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$page_new = pager_load_array($pager_page_array[$element] + $interval, $element, $pager_page_array);
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// If the next page is the last page, mark the link as such.
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if ($page_new[$element] == ($pager_total[$element] - 1)) {
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$output = theme('pager_last', array('text' => $text, 'element' => $element, 'parameters' => $parameters));
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}
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// The next page is not the last page.
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else {
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$output = theme('pager_link', array('text' => $text, 'page_new' => $page_new, 'element' => $element, 'parameters' => $parameters));
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}
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}
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return $output;
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}
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/**
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* Format a "last page" link.
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*
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* @param $variables
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* An associative array containing:
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* - text: The name (or image) of the link.
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* - element: An optional integer to distinguish between multiple pagers on
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* one page.
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* - parameters: An associative array of query string parameters to append to
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* the pager links.
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*
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* @return
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* An HTML string that generates this piece of the query pager.
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*
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* @ingroup themeable
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*/
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function theme_pager_last($variables) {
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$text = $variables['text'];
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$element = $variables['element'];
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$parameters = $variables['parameters'];
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global $pager_page_array, $pager_total;
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$output = '';
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// If we are anywhere but the last page
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if ($pager_page_array[$element] < ($pager_total[$element] - 1)) {
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$output = theme('pager_link', array('text' => $text, 'page_new' => pager_load_array($pager_total[$element] - 1, $element, $pager_page_array), 'element' => $element, 'parameters' => $parameters));
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}
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return $output;
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}
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/**
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* Format a link to a specific query result page.
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*
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* @param $variables
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* An associative array containing:
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* - page_new: The first result to display on the linked page.
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* - element: An optional integer to distinguish between multiple pagers on
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* one page.
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* - parameters: An associative array of query string parameters to append to
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* the pager link.
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* - attributes: An associative array of HTML attributes to apply to a pager
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* anchor tag.
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*
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* @return
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* An HTML string that generates the link.
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*
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* @ingroup themeable
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*/
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function theme_pager_link($variables) {
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$text = $variables['text'];
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$page_new = $variables['page_new'];
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$element = $variables['element'];
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$parameters = $variables['parameters'];
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$attributes = $variables['attributes'];
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$page = isset($_GET['page']) ? $_GET['page'] : '';
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if ($new_page = implode(',', pager_load_array($page_new[$element], $element, explode(',', $page)))) {
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$parameters['page'] = $new_page;
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}
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$query = array();
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if (count($parameters)) {
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$query = drupal_get_query_parameters($parameters, array());
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}
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if ($query_pager = pager_get_query_parameters()) {
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$query = array_merge($query, $query_pager);
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}
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// Set each pager link title
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if (!isset($attributes['title'])) {
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static $titles = NULL;
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if (!isset($titles)) {
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$titles = array(
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t('« first') => t('Go to first page'),
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t('‹ previous') => t('Go to previous page'),
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t('next ›') => t('Go to next page'),
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||
t('last »') => t('Go to last page'),
|
||
);
|
||
}
|
||
if (isset($titles[$text])) {
|
||
$attributes['title'] = $titles[$text];
|
||
}
|
||
elseif (is_numeric($text)) {
|
||
$attributes['title'] = t('Go to page @number', array('@number' => $text));
|
||
}
|
||
}
|
||
|
||
return l($text, $_GET['q'], array('attributes' => $attributes, 'query' => $query));
|
||
}
|
||
|
||
/**
|
||
* @} 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; $i++) {
|
||
if (empty($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;
|
||
}
|