27 methods override FormInterface::validateForm()

ActionAdminManageForm::validateForm in drupal/core/modules/action/lib/Drupal/action/Form/ActionAdminManageForm.php
Form validation handler.
BanAdmin::validateForm in drupal/core/modules/ban/lib/Drupal/ban/Form/BanAdmin.php
Form validation handler.
BlockListController::validateForm in drupal/core/modules/block/lib/Drupal/block/BlockListController.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
ConditionPluginBase::validateForm in drupal/core/lib/Drupal/Core/Condition/ConditionPluginBase.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
ConfigExportForm::validateForm in drupal/core/modules/config/lib/Drupal/config/Form/ConfigExportForm.php
Form validation handler.
ConfigImportForm::validateForm in drupal/core/modules/config/lib/Drupal/config/Form/ConfigImportForm.php
Form validation handler.
ConfirmFormBase::validateForm in drupal/core/lib/Drupal/Core/Form/ConfirmFormBase.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
DateFormatFormBase::validateForm in drupal/core/modules/system/lib/Drupal/system/Form/DateFormatFormBase.php
Form validation handler.
EntityFormController::validateForm in drupal/core/lib/Drupal/Core/Entity/EntityFormController.php
Form validation handler.
FieldEditForm::validateForm in drupal/core/modules/field_ui/lib/Drupal/field_ui/Form/FieldEditForm.php
Form validation handler.
FieldInstanceEditForm::validateForm in drupal/core/modules/field_ui/lib/Drupal/field_ui/Form/FieldInstanceEditForm.php
Form validation handler.
FieldWidgetTypeForm::validateForm in drupal/core/modules/field_ui/lib/Drupal/field_ui/Form/FieldWidgetTypeForm.php
Form validation handler.
FileTestForm::validateForm in drupal/core/modules/file/tests/file_test/lib/Drupal/file_test/Form/FileTestForm.php
Form validation handler.
FormController::validateForm in drupal/core/modules/system/tests/modules/condition_test/lib/Drupal/condition_test/FormController.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
FormTestArgumentsObject::validateForm in drupal/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/FormTestArgumentsObject.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
FormTestControllerObject::validateForm in drupal/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/FormTestControllerObject.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
FormTestObject::validateForm in drupal/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/FormTestObject.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
FormTestServiceObject::validateForm in drupal/core/modules/system/tests/modules/form_test/lib/Drupal/form_test/FormTestServiceObject.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
OpmlFeedAdd::validateForm in drupal/core/modules/aggregator/lib/Drupal/aggregator/Form/OpmlFeedAdd.php
Form validation handler.
OverviewBase::validateForm in drupal/core/modules/field_ui/lib/Drupal/field_ui/OverviewBase.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
RoleListController::validateForm in drupal/core/modules/user/lib/Drupal/user/RoleListController.php
Form validation handler.
SimpletestResultsForm::validateForm in drupal/core/modules/simpletest/lib/Drupal/simpletest/Form/SimpletestResultsForm.php
Form validation handler.
SimpletestTestForm::validateForm in drupal/core/modules/simpletest/lib/Drupal/simpletest/Form/SimpletestTestForm.php
Form validation handler.
SystemConfigFormBase::validateForm in drupal/core/modules/system/lib/Drupal/system/SystemConfigFormBase.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
ViewsFormBase::validateForm in drupal/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/ViewsFormBase.php
Implements \Drupal\Core\Form\FormInterface::validateForm().
ViewsTestDataElementForm::validateForm in drupal/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Form/ViewsTestDataElementForm.php
Form validation handler.
VocabularyListController::validateForm in drupal/core/modules/taxonomy/lib/Drupal/taxonomy/VocabularyListController.php
Form validation handler.