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Flutter has a powerful animations engine
for adding motion and effects to your Flutter app.
But sometimes, you just need to do something simple--
like fading in a widget.
And Flutter has you covered.
Flutter has a bunch of transitions ready to drop into your Flutter app.
Let's take a look at FadeTransition.
FadeTransition lets you fade a widget in and out.
It takes a child and an animation.
But where does the animation come from?
Well, first, we create an AnimationController
to set the duration,
and then we create an animation-- giving the start and end opacity values
and animating via the controller.
Finally, we start the animation by calling forward on the controller.
It's a good idea to wrap a FadeTransition in the StatefulWidget,
so you can manage its state and clean up once it's done.
For more info on Fade and other transitions,
head on over to flutter.io
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