keynavFailed
Emits the ::keynav-failed signal on the widget.
This function should be called whenever keyboard navigation within a single widget hits a boundary.
The return value of this function should be interpreted in a way similar to the return value of method@Gtk.Widget.child_focus. When true is returned, stay in the widget, the failed keyboard navigation is OK and/or there is nowhere we can/should move the focus to. When false is returned, the caller should continue with keyboard navigation outside the widget, e.g. by calling method@Gtk.Widget.child_focus on the widget’s toplevel.
The default signal@Gtk.Widget::keynav-failed handler returns false for %GTK_DIR_TAB_FORWARD and %GTK_DIR_TAB_BACKWARD. For the other values of GtkDirectionType it returns true.
Whenever the default handler returns true, it also calls method@Gtk.Widget.error_bell to notify the user of the failed keyboard navigation.
A use case for providing an own implementation of ::keynav-failed (either by connecting to it or by overriding it) would be a row of class@Gtk.Entry widgets where the user should be able to navigate the entire row with the cursor keys, as e.g. known from user interfaces that require entering license keys.
Return
true if stopping keyboard navigation is fine, false if the emitting widget should try to handle the keyboard navigation attempt in its parent container(s).
Parameters
direction of focus movement