SimpleAction.addOnActivate

Indicates that the action was just activated.

parameter will always be of the expected type, i.e. the parameter type specified when the action was created. If an incorrect type is given when activating the action, this signal is not emitted.

Since GLib 2.40, if no handler is connected to this signal then the default behaviour for boolean-stated actions with a NULL parameter type is to toggle them via the change-state signal. For stateful actions where the state type is equal to the parameter type, the default is to forward them directly to change-state. This should allow almost all users of gio.SimpleAction to connect only one handler or the other.

class SimpleAction
gulong
addOnActivate
(
void delegate dlg
,
ConnectFlags connectFlags = cast(ConnectFlags)0
)

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Since

2.28