[ CCode ( type_id = "clapper_gtk_billboard_get_type ()" ) ]
public class Billboard : Container, Accessible, Buildable, ConstraintTarget
A layer where various messages can be displayed.
Billboard widget is meant to be overlaid on top of [class@ClapperGtk.Video] as a normal (non-fading) overlay.
It is used to display various messages/announcements and later takes care of fading them on its own.
If automatic volume/speed change notifications when their values do change are desired, functions for announcing them can be run in callbacks to corresponding property notify signals on the [class@Clapper.Player].