Note: this list is generated by looking for the string for this theme hook, so it may include some references that are not actually using this theme hook.

ajax_test_dialog in core/modules/simpletest/tests/ajax_test.module
Menu callback: Renders a form elements and links with #ajax['dialog'].
backdrop_common_theme in core/includes/common.inc
Provides theme registration for themes across .inc files.
backdrop_prepare_form in core/includes/form.inc
Prepares a structured form array.
backdrop_process_form in core/includes/form.inc
Processes a form submission.
book_theme in core/modules/book/book.module
Implements hook_theme().
color_theme in core/modules/color/color.module
Implements hook_theme().
CommentInterfaceTest::assertCommentLinks in core/modules/comment/tests/comment.test
Asserts that comment links appear according to the passed environment.
CommentInterfaceTest::setEnvironment in core/modules/comment/tests/comment.test
Re-configures the environment, module settings, and user permissions.
CommentInterfaceTest::testCommentLinks in core/modules/comment/tests/comment.test
Tests comment links.
comment_field_extra_fields in core/modules/comment/comment.module
Implements hook_field_extra_fields().
CommonBackdropSortUnitTest::setUp in core/modules/simpletest/tests/common.test
Sets up unit test environment.
CommonBackdropSortUnitTest::testBackdropSort in core/modules/simpletest/tests/common.test
Tests backdrop_sort().
contact_theme in core/modules/contact/contact.module
Implements hook_theme().
CustomLogoTestCase::testCustomLogo in core/modules/system/tests/system.test
Test the use of a custom logo.
date_combo_element_process in core/modules/date/date.elements.inc
Process an individual date element.
date_popup_element_process in core/modules/date/date.elements.inc
Javascript popup element processing.
date_select_element_process in core/modules/date/date.elements.inc
Flexible date/time drop-down selector.
date_text_element_process in core/modules/date/date.elements.inc
Text date input form.
date_theme in core/modules/date/date.module
Implements hook_theme().
date_timezone_element_process in core/modules/date/date.elements.inc
Creates a timezone form element.
date_year_range_element_process in core/modules/date/date.elements.inc
Process callback which creates a date_year_range form element.
entity_example_field_extra_fields in modules/examples/entity_example/entity_example.module
Implements hook_field_extra_fields().
field_attach_form in core/modules/field/field.attach.inc
Add form elements for all fields for an entity to a form structure.
field_bundle_settings in core/modules/field/field.module
Gets or sets administratively defined bundle settings.
field_default_form in core/modules/field/field.form.inc
Creates a form element for a field and can populate it with a default value.
field_info_max_weight in core/modules/field/field.info.inc
Returns the maximum weight of all the components in an entity.
field_multiple_value_form in core/modules/field/field.form.inc
Special handling to create form elements for multiple values.
field_ui_display_form in core/modules/field_ui/field_ui.admin.inc
Form constructor for the field display settings for a given display mode.
field_ui_field_overview_form in core/modules/field_ui/field_ui.admin.inc
Form constructor for the 'Manage fields' form of a bundle.
field_ui_field_overview_form_submit in core/modules/field_ui/field_ui.admin.inc
Form submission handler for field_ui_field_overview_form().
file_field_extra_fields in core/modules/file/file.module
Implements hook_field_extra_fields().
filter_theme in core/modules/filter/filter.module
Implements hook_theme().
FormsFormStorageTestCase::testImmutableFormLegacyProtection in core/modules/simpletest/tests/form.test
Verify that existing contrib code cannot overwrite immutable form state.
form_builder in core/includes/form.inc
Builds and processes all elements in the structured form array.
form_example_wizard in modules/examples/form_example/form_example_wizard.inc
The primary formbuilder function for the wizard form.
form_get_cache in core/includes/form.inc
Fetches a form from the cache.
form_set_cache in core/includes/form.inc
Stores a form in the cache.
form_test_storage_legacy_handler in core/modules/simpletest/tests/form_test.module
Emulate legacy AHAH-style ajax callback.
hook_field_extra_fields in core/modules/field/field.api.php
Exposes "pseudo-field" components on fieldable entities.
hook_field_extra_fields_alter in core/modules/field/field.api.php
Alter "pseudo-field" components on fieldable entities.
hook_install_tasks in core/modules/system/system.api.php
Return an array of tasks to be performed by an installation profile.
image_theme in core/modules/image/image.module
Implements hook_theme().
installer_browser_add_remove_queue_dialog_link_submit in core/modules/installer/installer.browser.inc
Submit handler for installer_browser_add_remove_queue_dialog_link().
installer_browser_install_queue_callback in core/modules/installer/installer.pages.inc
Menu callback; Allows for adding to and removing from the install queue.
installer_theme in core/modules/installer/installer.module
Implements hook_theme().
install_run_task in core/includes/install.core.inc
Runs an individual installation task.
install_tasks in core/includes/install.core.inc
Returns a list of all tasks the installer currently knows about.
language_theme in core/modules/language/language.module
Implements hook_theme().
layout_theme in core/modules/layout/layout.module
Implements hook_theme()
locale_theme in core/modules/locale/locale.module
Implements hook_theme().
menu_theme in core/modules/menu/menu.module
Implements hook_theme().
node_field_extra_fields in core/modules/node/node.module
Implements hook_field_extra_fields().
node_theme in core/modules/node/node.module
Implements hook_theme().
path_theme in core/modules/path/path.module
Implements hook_theme().
SearchBlockTestCase::testBlock in core/modules/search/tests/search.test
Test that the search block form works correctly.
SearchCommentCountToggleTestCase::setUp in core/modules/search/tests/search.test
Sets up a Backdrop site for running functional and integration tests.
SearchCommentTestCase::setUp in core/modules/search/tests/search.test
Sets up a Backdrop site for running functional and integration tests.
SearchConfigSettingsForm::setUp in core/modules/search/tests/search.test
Sets up a Backdrop site for running functional and integration tests.
search_block_configure in core/modules/search/search.module
Implements hook_block_configure().
search_block_info in core/modules/search/search.module
Implements hook_block_info().
search_form_layout_block_configure_form_alter in core/modules/search/search.module
Implements hook_form_FORM_ID_alter().
search_preprocess_block in core/modules/search/search.module
Implements hook_preprocess_block().
simpletest_theme in core/modules/simpletest/simpletest.module
Implements hook_theme().
system_element_info in core/modules/system/system.module
Implements hook_element_info().
system_settings_form_submit in core/modules/system/system.module
Form submission handler for system_settings_form().
system_theme in core/modules/system/system.module
Implements hook_theme().
tabledrag_example_theme in modules/examples/tabledrag_example/tabledrag_example.module
Implements hook_theme().
taxonomy_field_extra_fields in core/modules/taxonomy/taxonomy.module
Implements hook_field_extra_fields().
taxonomy_theme in core/modules/taxonomy/taxonomy.module
Implements hook_theme().
template_preprocess_date_views_filter_form in core/modules/date/date.theme.inc
Preprocessor for Date Views filter form.
template_preprocess_theming_example_text_form in modules/examples/theming_example/theming_example.module
Implements template_preprocess().
template_preprocess_views_exposed_form in core/modules/views/templates/views.theme.inc
Default theme function for all filter forms.
theme_book_admin_table in core/modules/book/book.admin.inc
Returns HTML for a book administration form.
theme_confirm_form in core/modules/system/system.theme.inc
Returns HTML for a confirmation form.
theme_exposed_filters in core/modules/system/system.theme.inc
Returns HTML for an exposed filter form.
theme_filter_admin_overview in core/modules/filter/filter.theme.inc
Returns HTML for the text format administration overview form.
theme_filter_format_editor_image_form in core/modules/filter/filter.theme.inc
theme_image_style_effects in core/modules/image/image.theme.inc
Returns HTML for a listing of the effects within a specific image style.
theme_language_admin_overview_form_table in core/modules/language/language.theme.inc
Returns HTML for the language overview form.
theme_language_negotiation_configure_form in core/modules/locale/locale.theme.inc
Returns HTML for the language negotiation configuration form.
theme_locale_date_format_form in core/modules/locale/locale.theme.inc
Returns themed HTML for the locale_date_format_form() form.
theme_menu_overview_form in core/modules/menu/menu.theme.inc
Returns HTML for the menu overview form into a table.
theme_node_preview_banner_form in core/modules/node/node.theme.inc
Returns HTML for node_preview_banner_form().
theme_path_bulk_update_form in core/modules/path/path.admin.inc
Returns HTML for the Path bulk update page.
theme_simpletest_result_summary in core/modules/simpletest/simpletest.theme.inc
Returns HTML for the summary status of a simpletest result.
theme_system_modules_fieldset in core/modules/system/system.theme.inc
Returns HTML for the modules form.
theme_system_modules_uninstall in core/modules/system/system.theme.inc
Returns HTML for a table of currently disabled modules.
theme_system_settings_form in core/modules/system/system.theme.inc
Returns HTML for a system settings form.
theme_tabledrag_example_parent_form in modules/examples/tabledrag_example/tabledrag_example_parent_form.inc
Theme callback for the tabledrag_example_parent_form form.
theme_tabledrag_example_simple_form in modules/examples/tabledrag_example/tabledrag_example_simple_form.inc
Theme callback for the tabledrag_example_simple_form form.
theme_taxonomy_overview_terms in core/modules/taxonomy/taxonomy.theme.inc
Returns HTML for a terms overview form as a sortable list of terms.
theme_theming_example_select_form in modules/examples/theming_example/theming_example.module
Theming a simple form.
theme_update_manager_update_form in core/modules/update/update.theme.inc
Returns HTML for the first page in the process of updating projects.
theme_user_admin_permissions in core/modules/user/user.theme.inc
Returns HTML for the administer permissions page.
theme_user_admin_roles in core/modules/user/user.theme.inc
Returns HTML for the role order form.
theme_views_form_views_form in core/modules/views/templates/views.theme.inc
Theme function for a View with form elements: replace the placeholders.
theme_views_ui_build_group_filter_form in core/modules/views_ui/views_ui.theme.inc
Theme the build group filter form.
theme_views_ui_expose_filter_form in core/modules/views_ui/views_ui.theme.inc
Theme the expose filter form.
theme_views_ui_rearrange_filter_form in core/modules/views_ui/views_ui.theme.inc
Turn the rearrange form into a proper table
theme_views_ui_rearrange_form in core/modules/views_ui/views_ui.theme.inc
Turn the rearrange form into a proper table
theme_views_ui_reorder_displays_form in core/modules/views_ui/views_ui.theme.inc
Turn the reorder form into a proper table
theme_views_ui_style_plugin_table in core/modules/views_ui/views_ui.theme.inc
Theme the form for the table style plugin
theming_example_theme in modules/examples/theming_example/theming_example.module
Implements hook_theme().
user_field_extra_fields in core/modules/user/user.module
Implements hook_field_extra_fields().
user_preprocess_block in core/modules/user/user.module
Implements hook_preprocess_block().
user_theme in core/modules/user/user.module
Implements hook_theme().
views_theme in core/modules/views/views.module
Implement hook_theme(). Register views theme functions.
views_ui_config_item_form in core/modules/views_ui/views_ui.admin.inc
Form to config_item items in the views UI.
views_ui_theme in core/modules/views_ui/views_ui.module
Implements hook_theme().
_field_extra_fields_pre_render in core/modules/field/field.module
Pre-render callback to adjust weights and visibility of non-field elements.
_field_info_prepare_extra_fields in core/modules/field/field.info.inc
Prepares 'extra fields' for the current run-time context.
_field_write_instance in core/modules/field/field.crud.inc
Stores an instance record in the field configuration database.
_form_example_steps in modules/examples/form_example/form_example_wizard.inc
Returns the list of steps and their associated forms.
_form_validate in core/includes/form.inc
Performs validation on form elements.
_node_add_access in core/modules/node/node.module
Access callback: Checks whether the user has permission to add a node.