flutter runagain you'll notice that Hop will be idling in the middle of your screen.
flutter runnow and press on the floating button on the bottom right, you'll notice that Hop jumps but after he jumps he just stands there! We need to return him to idle. The NimaWidget provides a callback for whenever an animation completes which we can use for this purpose.
flutter runagain and you'll see that Hop returns to idle after the jump completes.