RB.EntryView::have-selection-changed

def callback(entry_view, have_selection, user_param1, ...)

Emitted when the user first selects a row, or when no rows are selected any more.

entry_view :

instance of RB.EntryView that is emitting the signal

have_selection :

TRUE if one or more rows are selected

user_param1 :

first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)