To set up the DecoratedBoxTransition widget in Flutter:
1. Create the DecoratedBoxTransition widget.
2. Set its 'decoration' property to a DecorationTween whose 'begin' property is a BoxDecoration that describes your widget's appearance at the beginning of the animation, and whose 'end' property is a BoxDecoration that describes your widget's appearance at the end of the animation.
3. Call the animate method on the DecorationTween and pass in an AnimationController (ensure the parent state class has a TickerProviderStateMixin so as to be able to set 'vsync' to 'this'), and if you wish call repeat on the AnimationController.
4. Set the child property of the DecoratedBoxTransition to a widget of your choice.
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