interface FormInterface

ActionAdminManageForm.php in drupal/core/modules/action/lib/Drupal/action/Form/ActionAdminManageForm.php

Contains \Drupal\action\Form\ActionAdminManageForm.

BanAdmin.php in drupal/core/modules/ban/lib/Drupal/ban/Form/BanAdmin.php

Contains \Drupal\ban\Form\BanAdmin.

BlockListController.php in drupal/core/modules/block/lib/Drupal/block/BlockListController.php

Contains \Drupal\block\BlockListController.

ConditionInterface.php in drupal/core/lib/Drupal/Core/Condition/ConditionInterface.php

Contains \Drupal\Core\Condition\ConditionInterface.

ConfigExportForm.php in drupal/core/modules/config/lib/Drupal/config/Form/ConfigExportForm.php

... See full list

interface FormInterface {

  /**
   * Returns a unique string identifying the form.
   *
   * @return string
   *   The unique string identifying the form.
   */
  public function getFormID();

  /**
   * Form constructor.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param array $form_state
   *   An associative array containing the current state of the form.
   *
   * @return array
   *   The form structure.
   */
  public function buildForm(array $form, array &$form_state);

  /**
   * Form validation handler.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param array $form_state
   *   An associative array containing the current state of the form.
   */
  public function validateForm(array &$form, array &$form_state);

  /**
   * Form submission handler.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param array $form_state
   *   An associative array containing the current state of the form.
   */
  public function submitForm(array &$form, array &$form_state);

}