Animated Flutter Dismissible

dismissible_animated.dart

Tween<Offset> _offSetTween = Tween(
  begin: Offset(1, 0),
  end: Offset.zero,
);
...

@override
Widget build(BuildContext context) {
  return Scaffold(
    ...
    body: AnimatedList(
      key: _animatedListKey,
      initialItemCount: items.length,
      itemBuilder: (context, index, animation) {
        var item = items[index];
        return FadeTransition(
          opacity: animation,
          child: SlideTransition(
            position: _offSetTween.animate(animation),
            child: Dismissible(
                ...
               ),
          ),
        );
      },
    ),
  );
}

handleDismiss(DismissDirection direction, int index) {
  ...
  
  // Remove it from the list
  items.removeAt(index);
  // Remove it from the animated list
 _animatedListKey.currentState.removeItem(
  index,
  (context, animation) {
    return SizedBox();
  },

  ...
  _scaffoldKey.currentState
      .showSnackBar(
        SnackBar(
          ...
          action: SnackBarAction(
              label: "Undo",
              textColor: Colors.yellow,
              onPressed: () {
                // Deep copy the email
                final copiedEmail = Email.copy(swipedEmail);
                // Insert it at swiped position and set state
                items.insert(index, copiedEmail);
                // Also insert the item to the AnimatedList
                _animatedListKey.currentState.insertItem(index);
              }),
        ),
      )
      ...
}