Checks whether there is a #GdkScreen is associated with
this widget. All toplevel widgets have an associated
screen, and all widgets added into a hierarchy with a toplevel
window at the top.
Return: %TRUE if there is a #GdkScreen associcated
with the widget.
Checks whether there is a #GdkScreen is associated with this widget. All toplevel widgets have an associated screen, and all widgets added into a hierarchy with a toplevel window at the top.
Return: %TRUE if there is a #GdkScreen associcated with the widget.