date_views_argument_handler::default_actions in core/modules/date/views/date_views_argument_handler.inc

Provide a list of default behaviors for this argument if the argument is not present.

views_handler_argument::default_action in core/modules/views/handlers/views_handler_argument.inc

Handle the default action, which means our argument wasn't present.

views_handler_argument::has_default_argument in core/modules/views/handlers/views_handler_argument.inc

Determine if the argument is set to provide a default argument.

views_handler_argument::needs_style_plugin in core/modules/views/handlers/views_handler_argument.inc

Determine if the argument needs a style plugin.

views_handler_argument::options_form in core/modules/views/handlers/views_handler_argument.inc

Build the options form.

views_handler_argument::uses_breadcrumb in core/modules/views/handlers/views_handler_argument.inc

Determine if the argument can generate a breadcrumb

views_handler_argument::validate_argument in core/modules/views/handlers/views_handler_argument.inc

Called by the menu system to validate an argument.

views_handler_argument::validate_fail in core/modules/views/handlers/views_handler_argument.inc

How to act if validation failes

views_handler_argument_comment_user_uid::default_actions in core/modules/comment/views/views_handler_argument_comment_user_uid.inc

Provide a list of default behaviors for this argument if the argument is not present.

views_handler_argument_null::default_actions in core/modules/views/handlers/views_handler_argument_null.inc

Override default_actions() to remove actions that don't make sense for a null argument.

views_handler_argument_term_node_tid_depth::default_actions in core/modules/taxonomy/views/views_handler_argument_term_node_tid_depth.inc

Override default_actions() to remove summary actions.