public final class ReliefStyle
The relief to be drawn around a Button. Ordinarily when you think of a
Button you think of something that can obviously be pressed, and the relief
that GTK theme engines draw around Buttons emphasizes this accordingly. You
can, however, change this behaviour with this class.
Draw no relief around the Button at all. This is actually a misnomer:
no relief is drawn except when the mouse hovers over it, at which point
it suddenly decorates up like the Button it really is. This is terrific
when you do not want a Button to attract attention, but want to give a
hint that it actually is a Button when the user's mouse hovers
over it and when the Button is activated.