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- <?php
- // $Id: tablesort.inc,v 1.47 2008/01/04 09:31:48 goba Exp $
-
- /**
- * @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']) {
- // Based on code from db_escape_table(), but this can also contain a dot.
- $field = preg_replace('/[^A-Za-z0-9_.]+/', '', $ts['sql']);
-
- // Sort order can only be ASC or DESC.
- $sort = drupal_strtoupper($ts['sort']);
- $sort = in_array($sort, array('ASC', 'DESC')) ? $sort : '';
-
- return " ORDER BY $before $field $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';
- }
-