imagecache + thickbox

This is a small but very useful patch to used imagecache.module and thickbox.module together in Drupal 5. If imagecache.module AND thickbox.module (http://drupal.org/project/thickbox) are available, then for every imagecache preset an additional imagache+thickbox formatter is available. Let's say you have defined an imagecache preset named 'thumbnail', then you'll automatically get an additonal formatter named 'Thickbox: thumbnail'. If you choose this formatter e.g. for the body, then the imagecache 'thumbnail'-preset is used to show a clickable preview image of the full-size image. If you click the preview, Thickbox is used to nicely overlay the fullsize image over the current page. If the imagefield has multiple images, they are treated like a gallery and thickbox displays 'Next' and 'Prev' buttons.

I hope you like it and integrate it into the official release of imagefield.module. The patch I post here is done relative to the 5.x-1.x-dev version. Please tell me if I should provide a patch for the HEAD version. Anyway, the changes to imagefield.module are not very much. I had to add some code to imagefield_field_formatter_info(), imagefield_field_formatter() and added a new theme-function:

new code in imagefield_field_formatter_info():

  if ( module_exists('imagecache') && module_exists('thickbox') ) {
    $rules = _imagecache_get_presets();
    foreach ($rules as $ruleid => $rulename) {
      $formatters['thickbox]['.$rulename] = array(
        'label' => 'Thickbox: '.$rulename,
        'field types' => array('image'),
        );
    }
  }

new code in imagefield_field_formatter():

  if ( module_exists('imagecache') && module_exists('thickbox') ) {
    if (strpos($formatter, 'thickbox][') !== false) {
      list($null, $namespace) = explode('][', $formatter, 2);
      $rules = _imagecache_get_presets();
      if (in_array($namespace, (array) $rules)) {
        return theme('imagefield_image_imagecache_thickbox', $namespace, $field, $file['filepath'], $item['alt'], $item['title']);
      }
    }
  }

new theme function :

function theme_imagefield_image_imagecache_thickbox($namespace, $field, $path, $alt = '', $title = '', $attributes = NULL) {
  $attributes = drupal_attributes($attributes);
  $imagecache_path =  file_create_url(file_directory_path() .'/imagecache/'. $namespace .'/'. $path);
  return '<a href="'. check_url(file_create_url($path)) .'" class="thickbox" rel="'. $field['type_name'] .'"><img src="'. $imagecache_path .'" alt="'. check_plain($alt) .'" title="'. check_plain($title) .'" '. $attributes .' /></a>';
}

That's it! ;)

Note: There is no drupal 5 release of thickbox.module, yet. You have to install the HEAD-version of thickbox.module to test my patch.