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
gtk.widget.Widget.childFocus. 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
gtk.widget.Widget.childFocus on the widget’s toplevel.
Whenever the default handler returns true, it also calls
gtk.widget.Widget.errorBell 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
gtk.entry.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.
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).
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 gtk.widget.Widget.childFocus. 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 gtk.widget.Widget.childFocus on the widget’s toplevel.
The default signalGtk.Widget::keynav-failed handler returns false for gtk.types.DirectionType.TabForward and gtk.types.DirectionType.TabBackward. For the other values of gtk.types.DirectionType it returns true.
Whenever the default handler returns true, it also calls gtk.widget.Widget.errorBell 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 gtk.entry.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.