materio-base-d7/sites/all/modules/contrib/files/styles/styles.module

<?php

/**
 *  @file
 *  Bundles similar display formatters together.
 */

// A registry of variable_get defaults.
include_once('includes/styles.variables.inc');

// Include get_called_class() for PHP < 5.3.
if(!function_exists('get_called_class')) {
  include_once('includes/php/get_called_class.inc');
}

/**
 *  Implements hook_field_formatter_info().
 */
function styles_field_formatter_info() {
  $info = array();
  foreach (styles_default_styles() as $field_type => $styles) {
    foreach ($styles['styles'] as $style) {
      $style_name = $style['name'];
      $info['styles_' . $field_type . '_' . $style_name] = array(
        'label' => t('@field style: @style', array('@field' => ucfirst($field_type), '@style' => $style_name)),
        'field types' => array($field_type),
        'behaviors' => array(
          'multiple values' => FIELD_BEHAVIOR_DEFAULT,
        ),
        'theme' => array('function' => 'theme_styles_field_formatter')
      );
    }
  }
  return $info;
}

/**
 *  Implements hook_field_formatter_view().
 */
function styles_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array('#formatter' => $display['type']);
  foreach ($items as $delta => $item) {
    // @todo The variable name 'object' is misleading, but retained for
    //   backwards compatibility until a broader refactoring of the Styles
    //   module. For now, it's the $item array cast to an object. For File and
    //   Image fields, this is a fully loaded file object, because
    //   file_field_load() loads the referenced file and merges its properties
    //   into $item, but for other field types, it may simply be raw field data.
    $element[$delta] = array('#markup' => theme('styles_field_formatter', array('element' => $element, 'object' => (object) $item, 'delta' => $delta, 'entity' => $entity)));
  }
  return $element;
}


/**
 *  Implements hook_theme().
 */
function styles_theme($existing, $type, $theme, $path) {
  return array(
    'styles' => array(
      'variables' => array('field_type' => NULL, 'style_name' => NULL, 'object' => NULL, 'instance' => NULL),
      'template' => 'styles',
      'path' => $path . '/themes',
      'file' => 'styles.theme.inc',
    ),
    'styles_field_formatter' => array(
      'variables' => array('render element' => 'element', 'element' => NULL, 'object' => NULL),
      'path' => $path . '/themes',
      'file' => 'styles.theme.inc',
    ),
  );
}

/**
 * Return all available containers for a specific field type.
 *
 * Modules implementing this hook should supply an array for each field type
 * that it supports, with at least two keys: 'containers', containing an
 * associated array described below, and 'filter callback' => A function to call
 * with the field object to determine which container to implement.
 *
 * Each container under a field type should be an associative array with the
 * following keys:
 *    'class' => The class to instantiate when filtering to this container.
 *    'filter match' => (Optional) A value to pass to the filter callback
 *        to match the field object against this container.
 *
 * Example implementation of hook_styles_default_containers():
 *  array(
 *    'emvideo' => array(
 *      'filter callback' => 'my_styles_emvideo_filter',
 *      'containers' => array(
 *        'brightcove' => array(
 *          'class' => 'BrightcoveStyles',
 *          'filter match' => array('brightcove'),
 *        ),
 *        'vimeo' => array(
 *          'class' => 'VimeoStyles',
 *          'filter match' => array('vimeo'),
 *        ),
 *        'youtube' => array(
 *          'class' => 'YouTubeStyles',
 *          'filter match' => array('youtube', 'my_youtube'),
 *        ),
 *      ),
 *    ),
 *  );
 *
 * @param string $return_type
 *  (Optional) The field type, such as file or nodereference.
 * @param boolean $reset
 *  (Optional) If TRUE, then we reset the cache.
 */
function styles_default_containers($return_type = NULL, $reset = FALSE) {
  $styles = &drupal_static(__FUNCTION__);

  // Grab from cache or build the array.
  if (!isset($styles) || $reset) {
    if (($cache = cache_get('styles_default_containers', 'cache_styles')) && !$reset) {
      $styles = $cache->data;
    }
    else {
      $styles = array();
      styles_module_load_all_includes();
      foreach (module_implements('styles_default_containers') as $module) {
        $module_styles = module_invoke($module, 'styles_default_containers');
        foreach ($module_styles as $field_type => $container) {
          $styles[$field_type] = isset($styles[$field_type]) ? $styles[$field_type] : array();
          // Pull out existing containers before the merge.
          $containers = isset($styles[$field_type]['containers']) ? $styles[$field_type]['containers'] : array();
          // Merge in the module defined containers.
          $styles[$field_type] = array_merge($styles[$field_type], $container);
          $styles[$field_type]['containers'] = isset($styles[$field_type]['containers']) ? $styles[$field_type]['containers'] : array();
          $styles[$field_type]['containers'] = array_merge($containers, $styles[$field_type]['containers']);
          foreach ($container['containers'] as $style_name => $style) {
            $style['name'] = $style_name;
            $style['module'] = $module;
            $style['storage'] = STYLES_STORAGE_DEFAULT;
            $styles[$field_type]['containers'][$style_name] = $style;
          }
        }
      }
      drupal_alter('styles_default_containers', $styles);
      cache_set('styles_default_containers', $styles, 'cache_styles');
    }
  }
  if (isset($return_type)) {
     return $styles[$return_type];
  }
  return $styles;
}

/**
 * Return all available styles for a specific field type.
 *
 * Each style under a field type should be an associative array with the
 * following optional keys:
 *    'description' => An untranslated human readable description for the style.
 *    'default theme' => The theme to call for display if there is no preset
 *      returned when filtering the field.
 *    'default theme arguments' => Any arguments to pass after the first (of
 *      the field's object itself).
 *
 * Example implementation of hook_styles_default_styles():
 *  array(
 *    'nodereference' => array(
 *      'styles' => array(
 *        'thumbnail' => array(
 *          'description' => 'Representative thumbnails linking to the content page.',
 *          'default theme' => 'my_styles_default_thumbnail',
 *        ),
 *        'small' => array(
 *          'description' => 'Small images linking to the content page.',
 *          'default theme' => 'my_styles_default_thumbnail',
 *        ),
 *        'teaser' => array(
 *          'description' => 'A short summary of the content.',
 *          'default theme' => 'node_view',
 *          'default theme arguments' => array(TRUE),
 *        ),
 *      ),
 *    ),
 *  );
 *
 * This will create those styles, allowing
 *
 * @param string $field_type
 *  (Optional) The field type, such as filefield or nodereference.
 * @param boolean $reset
 *  (Optional) If TRUE, then we reset the cache.
 */
function styles_default_styles($return_type = NULL, $reset = FALSE) {
  $styles = &drupal_static(__FUNCTION__);

  // Grab from cache or build the array.
  if (!isset($styles) || $reset) {
    if (($cache = cache_get('styles_default_styles', 'cache_styles')) && !$reset) {
      $styles = $cache->data;
    }
    else {
      $styles = array();
      styles_module_load_all_includes();
      foreach (module_implements('styles_default_styles') as $module) {
        $module_styles = module_invoke($module, 'styles_default_styles');
        foreach ($module_styles as $field_type => $container) {
          $styles[$field_type] = isset($styles[$field_type]) ? $styles[$field_type] : array();
          $containers = isset($styles[$field_type]['styles']) ? $styles[$field_type]['styles'] : array();
          $styles[$field_type] = array_merge($styles[$field_type], $container);
          $styles[$field_type]['styles'] = isset($styles[$field_type]['styles']) ? $styles[$field_type]['styles'] : array();
          $styles[$field_type]['styles'] = array_merge($containers, $styles[$field_type]['styles']);
          foreach ($container['styles'] as $style_name => $style) {
            $style['name'] = $style_name;
            $style['module'] = $module;
            $style['storage'] = STYLES_STORAGE_DEFAULT;
            $style['field_type'] = $field_type;
            $style['description'] = isset($style['description']) ? $style['description'] : '';
            $styles[$field_type]['styles'][$style_name] = $style;
          }
        }
      }

      // Add user defined & overridden styles next.
      $user_styles = db_select('styles', NULL, array('fetch' => PDO::FETCH_ASSOC))
        ->fields('styles')
        ->orderBy('name')
        ->execute()
        ->fetchAllAssoc('name', PDO::FETCH_ASSOC);

      foreach ($user_styles as $style_name => $style) {
        $field_type = $style['field_type'];
        $style['module'] = NULL;
        $style['storage'] = STYLES_STORAGE_NORMAL;
        if (isset($styles[$field_type]['styles'][$style_name]['module'])) {
          $style['module'] = $styles[$field_type]['styles'][$style_name]['module'];
          $style['storage'] = STYLES_STORAGE_OVERRIDE;
        }
        $styles[$field_type]['styles'][$style_name] = $style;
      }

      drupal_alter('styles_default_styles', $styles);
      cache_set('styles_default_styles', $styles, 'cache_styles');
    }
  }

  if (isset($return_type)) {
     return $styles[$return_type];
  }
  return $styles;
}

/**
 * Return all available presets for field type containers.
 *
 * Each container under a field type should be an associative array with the
 * following keys:
 *    'default preset' => The preset to select by default, which may be
 *      overridden later.
 *    'presets' => An associative array keyed by the preset name, each with
 *      an array of effects to be passed to the implementing class on display.
 *
 * Example implementation of hook_styles_default_presets():
 *  array(
 *    'filefield' => array(
 *      'containers' => array(
 *        'imagefield' => array(
 *          'default preset' => 'imagecache_thumbnail_linked',
 *          'presets' => array(
 *            'imagecache_thumbnail_linked' => array(
 *              'title' => '[node-title]',
 *              'alt' => '[file-description]',
 *              'imagecache_preset' => 'thumbnail',
 *              'link' => '[node-path]',
 *            ),
 *            'link_to_file' => array(
 *              'title' => '[file-title-raw]',
 *              'link' => '[file-path]',
 *            ),
 *          ),
 *        ),
 *      ),
 *    );
 *
 * @param string $field_type
 *  (Optional) The field type, such as filefield or nodereference.
 * @param boolean $reset
 *  (Optional) If TRUE, then we reset the cache.
 */
function styles_default_presets($return_type = NULL, $reset = FALSE) {
  $styles = &drupal_static(__FUNCTION__);

  // Grab from cache or build the array.
  if (!isset($styles) || $reset) {
    if (($cache = cache_get('styles_default_presets', 'cache_styles')) && !$reset) {
      $styles = $cache->data;
    }
    else {
      $styles = array();
      styles_module_load_all_includes();
      foreach (module_implements('styles_default_presets') as $module) {
        $module_styles = module_invoke($module, 'styles_default_presets');
        foreach ($module_styles as $field_type => $container) {
          $all_styles = styles_default_styles($field_type);
          $styles[$field_type] = isset($styles[$field_type]) ? $styles[$field_type] : array();
          $containers = isset($styles[$field_type]['containers']) ? $styles[$field_type]['containers'] : array();
          $styles[$field_type] = array_merge($styles[$field_type], $container);
          $styles[$field_type]['containers'] = isset($styles[$field_type]['containers']) ? $styles[$field_type]['containers'] : array();
          $styles[$field_type]['containers'] = array_merge($containers, $styles[$field_type]['containers']);
          foreach ($container['containers'] as $style_name => $style) {
            $style['name'] = $style_name;
            $style['module'] = $module;
            $style['storage'] = STYLES_STORAGE_DEFAULT;
            $style['styles'] = isset($style['styles']) ? $style['styles'] : array();
            $default_preset = isset($style['default preset']) ? $style['default preset'] : '';
            foreach ($all_styles['styles'] as $container_style_name => $container_style) {
              if (!isset($style['styles'][$container_style_name])) {
                $style['styles'][$container_style_name] = array(
                  'default preset' => $default_preset,
                );
              }
            }
            $styles[$field_type]['containers'][$style_name] = $style;
          }
        }
      }

      // Add user-defined and overridden presets.
      $query = db_select('styles_preset_instances', 'spi');
      $query->join('styles', 's', 's.sid = spi.sid');
      $query->join('styles_presets', 'p', 'p.pid = spi.pid');
      $query->addField('spi', 'sid');
      $query->addField('spi', 'pid');
      $query->addField('s', 'name', 'style_name');
      $query->addField('p', 'name', 'preset_name');
      $query->addField('p', 'field_type', 'field_type');
      $query->addField('p', 'container_name', 'container_name');
      $user_styles = $query->execute();
      foreach ($user_styles as $style) {
        if (isset($styles[$style->field_type]) && isset($styles[$style->field_type]['containers'][$style->container_name]) && isset($styles[$style->field_type]['containers'][$style->container_name]['presets'][$style->preset_name]) && isset($styles[$style->field_type]['containers'][$style->container_name]['styles'][$style->style_name])) {
          $styles[$style->field_type]['containers'][$style->container_name]['styles'][$style->style_name]['preset'] = $style->preset_name;
        }
      }

      drupal_alter('styles_default_presets', $styles);
      cache_set('styles_default_presets', $styles, 'cache_styles');
    }
  }

  if (isset($return_type)) {
     return $styles[$return_type];
  }
  return $styles;
}

/**
 * Load all registered module/styles.inc and modules/includes/styles.inc files.
 */
function styles_module_load_all_includes() {
  foreach (styles_get_registered_classes() as $class) {
    module_load_include('inc', $class['module'], 'styles');
    module_load_include('inc', $class['module'], $class['module'] .'/styles');
    module_load_include('inc', $class['module'], 'includes/'. $class['module'] .'.styles');
    module_load_include('inc', $class['module'], 'includes/styles/'. $class['module'] .'.styles');
  }
}

/**
 * Builds a registry of Style classes.
 *
 * Each module supporting a Style will need to implement
 * hook_styles_register, which will need to return an associated array keyed by
 * the style class name, with an array containing the following key => value
 * pairs:
 *  'field_types' => An array of field types to apply this style to.
 * The following key => value pairs are optional, which will otherwise be
 * automatically derived:
 *  'name' => The human-readable name of the style.
 *  'description' => A description of the style.
 *  'path' => The path where the class file resides.
 *  'file' => The file containing the class definition.
 *  'module' => The module defining the class.
 * The following key => value pair will be automatically set to the association
 * and cannot be overridden:
 *   'class_name' => The actual name of the class.
 *
 * @param string $style
 *  (Optional) The style of the specific class registration to return.
 * @param boolean $reset
 *  (Optional) If TRUE, then reset the registration.
 * @return array
 *  If $style is specified, then return only the specified class definition, or
 *  NULL if there is no such registered class. Otherwise, return the entire
 *  class definition registry.
 */
function styles_get_registered_classes($return_style = NULL, $reset = FALSE) {
  $registered_classes = &drupal_static(__FUNCTION__);

  if ($reset || !isset($registered_classes)) {
    $registered_classes = array();

    // Build our media object class registry.
    foreach (module_implements('styles_register') as $module) {
      foreach (module_invoke($module, 'styles_register') as $style => $class) {
        $registered_classes[$style] = is_array($class) ? $class : array();
        $registered_classes[$style]['class_name'] = $style;
        if (!isset($registered_classes[$style]['name'])) {
          $registered_classes[$style]['name'] = t($style);
        }
        if (!isset($registered_classes[$style]['description'])) {
          $registered_classes[$style]['description'] = t('Class definition for @style.', array('@style' => $style));
        }
        if (!isset($registered_classes[$style]['path'])) {
          $registered_classes[$style]['path'] = drupal_get_path('module', $module);
        }
        if (!isset($registered_classes[$style]['file'])) {
          $registered_classes[$style]['file'] = $style .'.inc';
        }
        if (!isset($registered_classes[$style]['module'])) {
          $registered_classes[$style]['module'] = $module;
        }
      }
    }
  }
  if (isset($return_style)) {
    return $registered_classes[$style];
  }
  return $registered_classes;
}

/**
 * Implementation of hook_init().
 */
function styles_init() {
  // Load all registered class definitions.
  styles_get_registered_classes();
}

/**
 * Return the registered Styles class definition specified by name.
 *
 * @param string $class_name
 *  (Optional) The name of the class definition to return. If NULL, then return
 *  all class definitions.
 * @param boolean $reset
 *  (Optional) If TRUE, then reset the static array of class definitions.
 * @return mixed
 *  Either the specified Styles class definition, or all defined definitions
 *  if $class_name is NULL.
 */
function styles_get_styles_class_by_class_name($class_name = NULL, $reset = FALSE) {
  $classes = &drupal_static(__FUNCTION__);

  if (!isset($classes) || $reset) {
    $classes = array();
    $registered_classes = styles_get_registered_classes();
    foreach ($registered_classes as $scheme => $class) {
      $classes[$class['class_name']] = $class;
    }
  }
  if (isset($class_name) && isset($classes[$class_name])) {
    return $classes[$class_name];
  }
  else if (!isset($class_name)) {
    return $classes;
  }
}

function styles_instance($variables) {
  static $id = 0;

  $variables['id'] = $id++;
  $field_type = $variables['field_type'];
  $style_name = $variables['style_name'];
  $object = $variables['object'];

  // Grab the containers for this field type.
  $containers = styles_default_containers($field_type);
  $variables['containers'] = $containers['containers'];
  $callback = $containers['filter callback'];

  // Find the correct container for this field type's styles.
  if (function_exists($callback)) {
    $container = call_user_func_array($callback, array($variables['object'], $variables));
    $variables['container'] = $container && isset($variables['containers'][$container]) ? $variables['containers'][$container] : array();
  }
  else {
    $variables['container'] = array();
  }

  // Grab the styles.
  $styles = styles_default_styles($field_type);
  $variables['styles'] = $styles['styles'];
  $variables['style'] = $style_name && isset($variables['styles'][$style_name]) ? $variables['styles'][$style_name] : array();

  // Grab the presets.
  $presets = styles_default_presets($field_type);
  $variables['presets'] = $container && isset($presets['containers'][$container]) ? $presets['containers'][$container] : array();
  $variables['preset_style'] = isset($variables['presets']['styles'][$style_name]) ? $variables['presets']['styles'][$style_name] : array();
  $variables['default preset'] = (isset($variables['preset_style']['default preset']) ? $variables['preset_style']['default preset'] : (isset($variables['presets']['default preset']) ? $variables['presets']['default preset'] : ''));
  $variables['preset'] = isset($variables['preset_style']['selected preset']) ? $variables['preset_style']['selected preset'] : (isset($variables['preset_style']['preset']) ? $variables['preset_style']['preset'] : $variables['default preset']);
  $variables['effects'] = ($variables['preset'] !== '') && isset($variables['presets']['presets'][$variables['preset']]) ? $variables['presets']['presets'][$variables['preset']] : array();

  // Instantiate the class and render the output.
  if ($class = $variables['container']['class']) {
    return new $variables['container']['class']($variables['object'], $variables['effects'], $variables);
  }
}

/**
 * Load a style by style name or ID. May be used as a loader for menu items.
 *
 * @param $field_type
 *   The field type for this style.
 * @param $name
 *   The name of the style.
 * @param $sid
 *   Optional. The numeric id of a style if the name is not known.
 * @param $include
 *   If set, this loader will restrict to a specific type of style, may be
 *   one of the defined style storage constants.
 * @return
 *   A style array containing the following keys:
 *   - "sid": The unique style ID.
 *   - "name": The unique style name.
 *   If the style name or ID is not valid, an empty array is returned.
 */
function styles_style_load($field_type, $name = NULL, $sid = NULL, $include = NULL) {
  $styles = styles_default_styles($field_type);

  // If retrieving by name.
  if (isset($name) && isset($styles['styles'][$name])) {
    $style = $styles['styles'][$name];
  }

  // If retrieving by style id.
  if (!isset($name) && isset($sid)) {
    foreach ($styles['styles'] as $name => $database_style) {
      if (isset($database_style['sid']) && $database_style['sid'] == $sid) {
        $style = $database_style;
        break;
      }
    }
  }

  // Restrict to the specific type of flag. This bitwise operation basically
  // states "if the storage is X, then allow".
  if (isset($style) && (!isset($include) || ($style['storage'] & (int) $include))) {
    return $style;
  }

  // Otherwise the style was not found.
  return array();
}

/**
 * Save a style/preset instance.
 *
 * @param string $field_type
 *  The field type of the style/preset to save.
 * @param string $container_name
 *  The container.
 * @param string $style_name
 *  The name of the style to save to.
 * @param string $preset_name
 *  The name of the preset.
 * @param boolean $delete_only
 *  If TRUE, then we delete only, rather than saving.
 *
 * @return boolean
 *  Return TRUE, or FALSE if the save was not successful.
 *
 * @TODO: Throw an error instead?
 */
function styles_style_save_preset($field_type, $container_name, $style_name, $preset_name, $delete_only = FALSE) {
  $query = db_select('styles_presets', 'p');
  $query->addField('p', 'pid');
  $query->condition('p.name', $preset_name);
  $query->condition('p.field_type', $field_type);
  $query->condition('p.container_name', $container_name);
  $result = $query->execute();

  foreach ($result as $preset) {
    $preset = (array)$preset;
  }
  if (empty($preset)) {
    $preset = array(
      'name' => $preset_name,
      'field_type' => $field_type,
      'container_name' => $container_name
    );
    drupal_write_record('styles_presets', $preset);
  }

  $styles = styles_default_styles($field_type);
  if (!isset($styles['styles'][$style_name])) {
    return FALSE;
  }
  else {
    $style = $styles['styles'][$style_name];
  }

  if (!isset($style['sid'])) {
    return FALSE;
  }

  // Delete old style/preset instances for this container.
  // Unfortunately, we can't use joins with DeleteQuery. See following comment.
  db_query("DELETE FROM {styles_preset_instances} WHERE {styles_preset_instances}.sid = :sid AND EXISTS (SELECT * FROM {styles} s, {styles_presets} p WHERE s.sid = {styles_preset_instances}.sid AND p.pid = {styles_preset_instances}.pid AND s.field_type = p.field_type AND p.container_name = :container_name);", array(':sid' => $style['sid'], ':container_name' => $container_name));

  // @TODO: See if there's a way to implement something like the following:
//   db_delete('styles_preset_instances')
//     ->join('styles', 's')
//     ->join('styles_presets', 'p')
//     ->condition('s.sid', 'styles_preset_instances.sid')
//     ->condition('styles_preset_instances.pid', 'p.pid')
//     ->condition('s.field_type', 'p.field_type')
//     ->condition('styles_preset_instances.sid', $style['sid'])
//     ->condition('p.container_name', $container_name)
//     ->execute();

  // Write the revised style for an update, unless we're only deleting the old.
  if (!$delete_only) {
    $record = array(
      'sid' => $style['sid'],
      'pid' => $preset['pid'],
    );

    drupal_write_record('styles_preset_instances', $record);
  }

  // Let other modules update as necessary on save.
  module_invoke_all('styles_preset_save', $field_type, $container_name, $style_name, $preset_name, $delete_only);

  // Clear all caches and flush.
  styles_style_flush($style);

  return TRUE;
}

function styles_style_delete($field_type, $style_name) {
  // Let other modules update as necessary on deletion.
  module_invoke_all('styles_delete', $field_type, $style_name);

  $sid = db_select('styles', 's')
    ->fields('s', array('sid'))
    ->condition('name', $style_name)
    ->condition('field_type', $field_type)
    ->execute()
    ->fetchField();
  if ($sid) {
    db_delete('styles_preset_instances')
      ->condition('sid', $sid)
      ->execute();
    db_delete('styles')
      ->condition('sid', $sid)
      ->execute();
  }
  // Clear all caches and flush.
  styles_style_flush();
}

function styles_style_save(&$style) {
  if (isset($style['sid']) && is_numeric($style['sid'])) {
    // Load the existing style to make sure we account for renamed styles.
    $old_style = styles_style_load($style['field_type'], NULL, $style['sid']);
    styles_style_flush($old_style);
    drupal_write_record('styles', $style, 'sid');
    if ($old_style['name'] != $style['name']) {
      $style['old_name'] = $old_style['name'];
    }
  }
  else if (isset($style['name'])) {
    // Load the existing style to make sure we account for renamed styles.
    $old_style = styles_style_load($style['field_type'], $style['name']);
    styles_style_flush($old_style);
    if (isset($old_style['sid'])) {
      $style['sid'] = $old_style['sid'];
      drupal_write_record('styles', $style, 'sid');
    }
    else {
      drupal_write_record('styles', $style);
      $style['is_new'] = TRUE;
    }
    if (isset($old_style['name'])) {
      $style['old_name'] = $old_style['name'];
    }
  }
  else {
    drupal_write_record('styles', $style);
    $style['is_new'] = TRUE;
  }

  // Let other modules update as necessary on save.
  module_invoke_all('styles_style_save', $style);

  // Clear all caches and flush.
  styles_style_flush($style);

  return $style;
}

/**
 * Flush cached defaults for a style.
 *
 * @param $style
 *   A style array.
 */
function styles_style_flush($style = NULL) {
  // Clear style and preset caches.
  cache_clear_all('styles_default_styles', 'cache_styles');
  cache_clear_all('styles_default_presets', 'cache_styles');
  cache_clear_all('styles_default_containers', 'cache_styles');
  drupal_static_reset('styles_default_styles');
  drupal_static_reset('styles_default_presets');
  drupal_static_reset('styles_default_containers');
  drupal_static_reset('styles_get_registered_classes');

  // Let other modules update as necessary on flush.
  module_invoke_all('styles_style_flush', $style);

  // Clear field caches so that formatters may be added for this style.
  field_info_cache_clear();
  drupal_theme_rebuild();

  // Clear page caches when flushing.
  if (module_exists('block')) {
    cache_clear_all('*', 'cache_block', TRUE);
  }
  cache_clear_all('*', 'cache_page', TRUE);
}

/**
 * Implementation of hook_flush_caches().
 */
function styles_flush_caches() {
  return array('cache_styles');
}