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<?php
// $Id$
/**
* @file
* Functions to aid in the creation of sortable tables.
*
* All tables created with a call to theme('table') have the option of having
* column headers that the user can click on to sort the table by that column.
*/
/**
* Initialize the table sort context.
*/
function tablesort_init($header) {
$ts = tablesort_get_order($header);
$ts['sort'] = tablesort_get_sort($header);
$ts['query_string'] = tablesort_get_querystring();
return $ts;
}
/**
* Create an SQL sort clause.
*
* This function produces the ORDER BY clause to insert in your SQL queries,
* assuring that the returned database table rows match the sort order chosen
* by the user.
*
* @param $header
* An array of column headers in the format described in theme_table().
* @param $before
* An SQL string to insert after ORDER BY and before the table sorting code.
* Useful for sorting by important attributes like "sticky" first.
* @return
* An SQL string to append to the end of a query.
*
* @ingroup database
*/
function tablesort_sql($header, $before = '') {
$ts = tablesort_init($header);
if ($ts['sql']) {
$sql = db_escape_string($ts['sql']);
$sort = drupal_strtoupper(db_escape_string($ts['sort']));
return " ORDER BY $before $sql $sort";
}
}
/**
* Format a column header.
*
* If the cell in question is the column header for the current sort criterion,
* it gets special formatting. All possible sort criteria become links.
*
* @param $cell
* The cell to format.
* @param $header
* An array of column headers in the format described in theme_table().
* @param $ts
* The current table sort context as returned from tablesort_init().
* @return
* A properly formatted cell, ready for _theme_table_cell().
*/
function tablesort_header($cell, $header, $ts) {
// Special formatting for the currently sorted column header.
if (is_array($cell) && isset($cell['field'])) {
$title = t('sort by @s', array('@s' => $cell['data']));
if ($cell['data'] == $ts['name']) {
$ts['sort'] = (($ts['sort'] == 'asc') ? 'desc' : 'asc');
if (isset($cell['class'])) {
$cell['class'] .= ' active';
}
else {
$cell['class'] = 'active';
}
$image = theme('tablesort_indicator', $ts['sort']);
}
else {
// If the user clicks a different header, we want to sort ascending initially.
$ts['sort'] = 'asc';
$image = '';
}
if (!empty($ts['query_string'])) {
$ts['query_string'] = '&'. $ts['query_string'];
}
$cell['data'] = l($cell['data'] . $image, $_GET['q'], array('attributes' => array('title' => $title), 'query' => 'sort='. $ts['sort'] .'&order='. urlencode($cell['data']) . $ts['query_string'], 'html' => TRUE));
unset($cell['field'], $cell['sort']);
}
return $cell;
}
/**
* Format a table cell.
*
* Adds a class attribute to all cells in the currently active column.
*
* @param $cell
* The cell to format.
* @param $header
* An array of column headers in the format described in theme_table().
* @param $ts
* The current table sort context as returned from tablesort_init().
* @param $i
* The index of the cell's table column.
* @return
* A properly formatted cell, ready for _theme_table_cell().
*/
function tablesort_cell($cell, $header, $ts, $i) {
if (isset($header[$i]['data']) && $header[$i]['data'] == $ts['name'] && !empty($header[$i]['field'])) {
if (is_array($cell)) {
if (isset($cell['class'])) {
$cell['class'] .= ' active';
}
else {
$cell['class'] = 'active';
}
}
else {
$cell = array('data' => $cell, 'class' => 'active');
}
}
return $cell;
}
/**
* Compose a query string to append to table sorting requests.
*
* @return
* A query string that consists of all components of the current page request
* except for those pertaining to table sorting.
*/
function tablesort_get_querystring() {
return drupal_query_string_encode($_REQUEST, array_merge(array('q', 'sort', 'order'), array_keys($_COOKIE)));
}
/**
* Determine the current sort criterion.
*
* @param $headers
* An array of column headers in the format described in theme_table().
* @return
* An associative array describing the criterion, containing the keys:
* - "name": The localized title of the table column.
* - "sql": The name of the database field to sort on.
*/
function tablesort_get_order($headers) {
$order = isset($_GET['order']) ? $_GET['order'] : '';
foreach ($headers as $header) {
if (isset($header['data']) && $order == $header['data']) {
return array('name' => $header['data'], 'sql' => isset($header['field']) ? $header['field'] : '');
}
if (isset($header['sort']) && ($header['sort'] == 'asc' || $header['sort'] == 'desc')) {
$default = array('name' => $header['data'], 'sql' => isset($header['field']) ? $header['field'] : '');
}
}
if (isset($default)) {
return $default;
}
else {
// The first column specified is initial 'order by' field unless otherwise specified
if (is_array($headers[0])) {
$headers[0] += array('data' => NULL, 'field' => NULL);
return array('name' => $headers[0]['data'], 'sql' => $headers[0]['field']);
}
else {
return array('name' => $headers[0]);
}
}
}
/**
* Determine the current sort direction.
*
* @param $headers
* An array of column headers in the format described in theme_table().
* @return
* The current sort direction ("asc" or "desc").
*/
function tablesort_get_sort($headers) {
if (isset($_GET['sort'])) {
return ($_GET['sort'] == 'desc') ? 'desc' : 'asc';
}
// User has not specified a sort. Use default if specified; otherwise use "asc".
else {
foreach ($headers as $header) {
if (is_array($header) && array_key_exists('sort', $header)) {
return $header['sort'];
}
}
}
return 'asc';
}
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