layout_ajax_form_save_dialog in modules/layout/layout.admin.inc

AJAX handler that saves a form in a dialog and updates the underlying form.

layout_ajax_form_save_title_dialog in modules/layout/layout.admin.inc

layout_block_configure_ajax_update in modules/layout/layout.admin.inc

AJAX callback to update the underlying layout form after updating a block.

layout_content_form in modules/layout/layout.admin.inc

Form callback; Main form for editing a layout's content.

layout_menu_item_form in modules/layout/layout.admin.inc

Form callback; Configure a layout menu item.

layout_settings_form in modules/layout/layout.admin.inc

Render the settings form for layout.