gtk:color-chooser-use-alpha (object)

object -- a gtk:color-chooser widget
use-alpha -- true if the color chooser should use alpha channel, false if not

Accessor of the use-alpha slot of the gtk:color-chooser class. The gtk:color-chooser-use-alpha function returns whether the color chooser shows the alpha channel. The (setf gtk:color-chooser-use-alpha) function sets whether or not the color chooser should use the alpha channel.