activate
Description:
Activates the action.
parameter must be the correct type of parameter for the action (ie: the parameter type given at construction time). If the
parameter type was `NULL` then parameter must also be `NULL`.
If the parameter [type@GLib.Variant] is floating, it is consumed.
Parameters:
| this |
a [type@Gio.Action] |
| parameter |
the parameter to the activation |