如何在Flutter中创建滑入和滑出动画？

import 'package:flutter/material.dart';

class SlideAnimation extends StatefulWidget {
  @override
  _SlideAnimationState createState() => _SlideAnimationState();
}

class _SlideAnimationState extends State<SlideAnimation>
    with SingleTickerProviderStateMixin {
  AnimationController _animationController;
  Animation<Offset> _slideAnimation;

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 500),
    );

    _slideAnimation = Tween<Offset>(
      begin: Offset(1.0, 0.0),
      end: Offset.zero,
    ).animate(CurvedAnimation(
      parent: _animationController,
      curve: Curves.easeInOut,
    ));
  }

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Slide Animation'),
      ),
      body: Center(
        child: AnimatedBuilder(
          animation: _slideAnimation,
          builder: (BuildContext context, Widget child) {
            return SlideTransition(
              position: _slideAnimation,
              child: Container(
                width: 200,
                height: 200,
                color: Colors.blue,
              ),
            );
          },
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          if (_animationController.status == AnimationStatus.completed) {
            _animationController.reverse();
          } else {
            _animationController.forward();
          }
        },
        child: Icon(Icons.play_arrow),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: SlideAnimation(),
  ));
}