aku_new_community/lib/widget/animated/animated_transition.dart

import 'package:flutter/material.dart';

class AnimatedTranslate extends ImplicitlyAnimatedWidget {
  final Widget child;
  final Offset offset;

  AnimatedTranslate({this.child, this.offset})
      : super(
          duration: Duration(milliseconds: 300),
        );
  @override
  ImplicitlyAnimatedWidgetState<ImplicitlyAnimatedWidget> createState() =>
      _AnimatedTranslateState();
}

class _AnimatedTranslateState
    extends AnimatedWidgetBaseState<AnimatedTranslate> {
  Tween<Offset> _offsetTween;
  @override
  Widget build(BuildContext context) {
    return Transform.translate(
      offset: _offsetTween.evaluate(animation),
      child: widget.child,
    );
  }

  @override
  void forEachTween(visitor) {
    _offsetTween = visitor(
      _offsetTween,
      widget.offset,
      (value) => Tween<Offset>(begin: value),
    );
  }
}