[ ConcreteAccessor ]
public abstract bool use_alpha { get; set; }
Whether colors may have alpha (translucency).
When GtkColorChooser::use-alpha
is false, the `GdkRGBA` struct obtained via the [
[email protected]:rgba] property will be forced to have alpha == 1.
Implementations are expected to show alpha by rendering the color over a non-uniform background (like a checkerboard pattern).