Pointer to a FaderDesc data structure, into which the macro will copy the remaining parameters.
Pointer to the widget that will be the target of fader transitions.
Specifies the initial transparency level to be applied to the widget wrapped by the fader object
when the transition is started. A value of 0 would start that transition by drawing the widget
as fully opaque object. A value of 1 would add a small degree of transparency to the widget, 2
a little more, 3 a little more, and so on... A value of 255 would indicate complete transparency.
Specifies the transparency level that will end the fadeout transition.