leave (
  GtkEventControllerFocus* self,
  gpointer user_data

Description [src]

Emitted whenever the focus leaves the widget hierarchy that is rooted at the widget that the controller is attached to.

Note that this means you may not get a ::leave signal even though the focus moves away from the widget, in certain cases (such as when the focus moves from the widget to a descendent). If you are interested in these cases, you can monitor the GtkEventControllerFocus:is-focus property for changes.

Default handler:

The default handler is called after the handlers added via g_signal_connect().