Club Drupal

  $items['form_test/form-storage-legacy'] = array(

    'title' => 'Emulate legacy AHAH-style ajax callback',

    'page callback' => 'form_test_storage_legacy_handler',

    'access arguments' => array('access content'),

    'type' => MENU_CALLBACK,

  );

  $items['form_test/form-storage-page-cache'] = array(

    'title' => 'Form storage with page cache test',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('form_test_storage_page_cache_form'),

    'access arguments' => array('access content'),

    'type' => MENU_CALLBACK,

  );

  if (isset($_REQUEST['immutable'])) {

    $form_state['build_info']['immutable'] = TRUE;

  }

/**

 * Emulate legacy AHAH-style ajax callback.

 *

 * Drupal 6 AHAH callbacks used to operate directly on forms retrieved using

 * form_get_cache and stored using form_set_cache after manipulation. This

 * callback helps testing whether form_set_cache prevents resaving of immutable

 * forms.

 */

function form_test_storage_legacy_handler($form_build_id) {

  $form_state = array();

  $form = form_get_cache($form_build_id, $form_state);

  drupal_json_output(array(

    'form' => $form,

    'form_state' => $form_state,

  ));

  $form['#poisoned'] = TRUE;

  $form_state['poisoned'] = TRUE;

  form_set_cache($form_build_id, $form, $form_state);

}

/**

 * A simple form for testing form storage when page caching is enabled.

 */

function form_test_storage_page_cache_form($form, &$form_state) {

  $form['title'] = array(

    '#type' => 'textfield',

    '#title' => 'Title',

    '#required' => TRUE,

  );

  $form['test_build_id_old'] = array(

    '#type' => 'item',

    '#title' => 'Old build id',

    '#markup' => 'No old build id',

  );

  $form['submit'] = array(

    '#type' => 'submit',

    '#value' => 'Save',

  );

  $form['rebuild'] = array(

    '#type' => 'submit',

    '#value' => 'Rebuild',

    '#submit' => array('form_test_storage_page_cache_rebuild'),

  );

  $form['#after_build'] = array('form_test_storage_page_cache_old_build_id');

  $form_state['cache'] = TRUE;

  return $form;

}

/**

 * Form element #after_build callback: output the old form build-id.

 */

function form_test_storage_page_cache_old_build_id($form) {

  if (isset($form['#build_id_old'])) {

    $form['test_build_id_old']['#markup'] = check_plain($form['#build_id_old']);

  }

  return $form;

}

/**

 * Form submit callback: Rebuild the form and continue.

 */

function form_test_storage_page_cache_rebuild($form, &$form_state) {

  $form_state['rebuild'] = TRUE;

}