Club Drupal

 * Page callback to show file usage information.

 */

function file_entity_usage_page($file) {

  $rows = array();

  $occured_entities = array();

  // This var is set to TRUE when we are ready to save the file.

  $save = FALSE;

  $trigger = $form_state['triggering_element']['#id'];

  $steps_to_check = array(2, 3);

    // If the previous button was hit,

    // the step checking order should be reversed 3, 2.

    $steps_to_check = array_reverse($steps_to_check);

  foreach ($steps_to_check as $step) {

    // Check if we can skip step 2 and 3.

      $file = file_load($form_state['storage']['upload']);

      if ($step == 2) {

        // Check if we can skip step 2.

          $candidates_keys = array_keys($candidates);

          // There is only one possible filetype for this file.

          // Skip the second page.

          $form_state['storage']['type'] = reset($candidates_keys);

        }

        elseif (!$candidates || variable_get('file_entity_file_upload_wizard_skip_file_type', FALSE)) {

          // Do not assign the file a file type.

          $form_state['storage']['type'] = FILE_TYPE_NONE;

        }

      }

        if (!file_entity_file_is_writeable($file)) {

          // The file is read-only (remote) and must use its provided scheme.

          $form_state['storage']['scheme'] = file_uri_scheme($file->uri);

        }

        elseif (count($schemes) == 1) {

          // There is only one possible stream wrapper for this file.

          // Skip the third page.

          $form_state['storage']['scheme'] = key($schemes);

        }

        elseif (variable_get('file_entity_file_upload_wizard_skip_scheme', FALSE)) {

          // Fallback to the URI scheme specified in the field settings

          // otherwise use the default file scheme.

  }

  // We have the filetype, check if we can skip step 4.

    $file = file_load($form_state['storage']['upload']);

    $form_state['file'] = $file;

    if (!field_info_instances('file', $form_state['storage']['type'])) {

  // Form id's can vary depending on how many other forms are displayed, so we

  // need to do string comparissons. e.g edit-submit--2.

    $form_state['step'] = $form['#step'] + 1;

  }

    $form_state['step'] = $form['#step'] - 1;

  }

  elseif (strpos($trigger, 'edit-submit') !== FALSE) {