ColorTween constructor
Creates a Color tween.
The begin and end properties may be null; the null value is treated as transparent.
We recommend that you do not pass Colors.transparent as begin or end if you want the effect of fading in or out of transparent. Instead prefer null. Colors.transparent refers to black transparent and thus will fade out of or into black which is likely unwanted.
Implementation
ColorTween({ super.begin, super.end });