function multiform_drupal_build_subform in Multiple forms 7.2

1 call to multiform_drupal_build_subform()

multiform_get_form in ./multiform.module

Returns a form containing a number of other forms.

File

./multiform.form.inc, line 10

Code

function multiform_drupal_build_subform($form_id, &$form_state, &$unprocessed_form) {

  // Ensure some defaults; if already set they will not be overridden.
  $form_state += form_state_defaults();
  if (!isset($form_state['input'])) {
    $form_state['input'] = $form_state['method'] == 'get' ? $_GET : $_POST;
  }
  if (isset($_SESSION['batch_form_state'])) {

    // We've been redirected here after a batch processing. The form has
    // already been processed, but needs to be rebuilt. See _batch_finished().
    $form_state = $_SESSION['batch_form_state'];
    unset($_SESSION['batch_form_state']);
    return drupal_rebuild_form($form_id, $form_state);
  }

  // If the incoming input contains a form_build_id, we'll check the cache for a
  // copy of the form in question. If it's there, we don't have to rebuild the
  // form to proceed. In addition, if there is stored form_state data from a
  // previous step, we'll retrieve it so it can be passed on to the form
  // processing code.
  $check_cache = isset($form_state['input']['form_id']) && $form_state['input']['form_id'] == $form_id && !empty($form_state['input']['form_build_id']);
  if ($check_cache) {
    $form = form_get_cache($form_state['input']['form_build_id'], $form_state);
  }

  // If the previous bit of code didn't result in a populated $form object, we
  // are hitting the form for the first time and we need to build it from
  // scratch.
  if (!isset($form)) {

    // If we attempted to serve the form from cache, uncacheable $form_state
    // keys need to be removed after retrieving and preparing the form, except
    // any that were already set prior to retrieving the form.
    if ($check_cache) {
      $form_state_before_retrieval = $form_state;
    }
    $form = drupal_retrieve_form($form_id, $form_state);
    drupal_prepare_form($form_id, $form, $form_state);

    // form_set_cache() removes uncacheable $form_state keys defined in
    // form_state_keys_no_cache() in order for multi-step forms to work
    // properly. This means that form processing logic for single-step forms
    // using $form_state['cache'] may depend on data stored in those keys
    // during drupal_retrieve_form()/drupal_prepare_form(), but form
    // processing should not depend on whether the form is cached or not, so
    // $form_state is adjusted to match what it would be after a
    // form_set_cache()/form_get_cache() sequence. These exceptions are
    // allowed to survive here:
    // - always_process: Does not make sense in conjunction with form caching
    //   in the first place, since passing form_build_id as a GET parameter is
    //   not desired.
    // - temporary: Any assigned data is expected to survives within the same
    //   page request.
    if ($check_cache) {
      $uncacheable_keys = array_flip(array_diff(form_state_keys_no_cache(), array(
        'always_process',
        'temporary',
      )));
      $form_state = array_diff_key($form_state, $uncacheable_keys);
      $form_state += $form_state_before_retrieval;
    }
  }

  // Now that we have a constructed form, process it. This is where:
  // - Element #process functions get called to further refine $form.
  // - User input, if any, gets incorporated in the #value property of the
  //   corresponding elements and into $form_state['values'].
  // - Validation and submission handlers are called.
  // - If this submission is part of a multistep workflow, the form is rebuilt
  //   to contain the information of the next step.
  // - If necessary, the form and form state are cached or re-cached, so that
  //   appropriate information persists to the next page request.
  // All of the handlers in the pipeline receive $form_state by reference and
  // can use it to know or update information about the state of the form.
  $unprocessed_form = multiform_drupal_process_form_start($form_id, $form, $form_state);

  // If this was a successful submission of a single-step form or the last step
  // of a multi-step form, then drupal_process_form() issued a redirect to
  // another page, or back to this page, but as a new request. Therefore, if
  // we're here, it means that this is either a form being viewed initially
  // before any user input, or there was a validation error requiring the form
  // to be re-displayed, or we're in a multi-step workflow and need to display
  // the form's next step. In any case, we have what we need in $form, and can
  // return it for rendering.
  return $form;
}