Gtk::SymbolicPaintable is an interface that support symbolic colors in
Gdk::Paintables implementing the interface will have the
Gtk::SymbolicPaintable#snapshot_symbolic function called and
have the colors for drawing symbolic icons passed. At least 4 colors are guaranteed
to be passed every time.
These 4 colors are the foreground color, and the colors to use for errors, warnings and success information in that order.
More colors may be added in the future.
- #snapshot_symbolic(snapshot : Gdk::Snapshot, width : Float64, height : Float64, colors : Enumerable(Gdk::RGBA)) : Nil