Gio.SimpleAction::change-state

connect('change-state', function (simpleAction, value: GLib.Variant, ): void);
  

Indicates that the action just received a request to change its state.

value will always be of the correct state type. In the event that an incorrect type was given, no signal will be emitted.

If no handler is connected to this signal then the default behaviour is to call Gio.SimpleAction.prototype.set_state to set the state to the requested value. If you connect a signal handler then no default action is taken. If the state should change then you must call Gio.SimpleAction.prototype.set_state from the handler.

An example of a 'change-state' handler: |[<!-- language="C" --> static void change_volume_state (GSimpleAction *action, GVariant *value, gpointer user_data) { gint requested;

requested = g_variant_get_int32 (value);

// Volume only goes from 0 to 10 if (0 <= requested && requested <= 10) g_simple_action_set_state (action, value); } ]|

The handler need not set the state to the requested value. It could set it to any value at all, or take some other action.

Since 2.30