How to add delay between each repeat of animation in flutter - flutter

Question

I have a SlideTransition with a container in my application, and it repeats forever, but i would like a delay after each repeat. so it would be like this:
Here's my code
late final AnimationController _animationController = AnimationController(
vsync: this,
duration: const Duration(seconds: 1)
)..repeat(reverse: true); // Here there should be the 500 millisecond delay
late final Animation<Offset> _animation = Tween<Offset>(
begin: Offset.zero,
end: Offset(0, 1),
).animate(_animationController);
. . .
return Scaffold(
body: Center(
child: SlideTransition(
position: _animation,
child: Container(
height: 100,
width: 100,
color: Colors.red,
),
),
),
);

Answer 1

Just change the duration you want => await Future.delayed(Duration(seconds: 3));
I test it with seconds: 3 to get better idea.
late final AnimationController _animationController =
AnimationController(vsync: this, duration: const Duration(seconds: 3))
..forward();
#override
void initState() {
super.initState();
_animationController.addListener(() async {
print(_animationController.status);
if (_animationController.isCompleted) {
await Future.delayed(Duration(seconds: 3));
_animationController.reverse();
} else if (_animationController.isDismissed) {
await Future.delayed(Duration(seconds: 3));
_animationController.forward();
}
});
}

Answer 2

delay after each repeat :
#override
void initState() {// <-- add initstate
super.initState();
_animationController.forward(from: 0.0);
}
late final AnimationController _animationController = AnimationController(
vsync: this,
duration: const Duration(seconds: 1))
//..repeat(reverse: true); // <-- comment this line
..addStatusListener((AnimationStatus status) { // <-- add listener
if (status == AnimationStatus.completed) {
Future.delayed(
Duration(milliseconds: _animationController.value == 0 ? 500 : 0),
() {
_animationController
.animateTo(_animationController.value == 0 ? 1 : 0);
});
}
});