Container.setFocusChild

Sets, or unsets if child is null, the focused child of container.

This function emits the GtkContainer::set_focus_child signal of container. Implementations of #GtkContainer can override the default behaviour by overriding the class closure of this signal.

This is function is mostly meant to be used by widgets. Applications can use [gtk.widget.Widget.grabFocus] to manually set the focus to a specific widget.