A [keybinding signal][GtkBindingSignal] which gets emitted when the user activates the currently focused item.
Applications should not connect to it, but may emit it with
g_signal_emit_by_name() if they need to control activation programmatically.
The default bindings for this signal are Space, Return and Enter.
|Default handler:|| |
The default handler is called after the handlers added via
|The signal can be emitted directly|