如何在Flutter中制作手势驱动的动画？

AnimationController _controller;
double _scale = 1.0;
double _previousScale = 1.0;

@override
void initState() {
  super.initState();
  _controller = AnimationController(
    vsync: this,
    duration: Duration(milliseconds: 300),
  );
}

@override
Widget build(BuildContext context) {
  return GestureDetector(
    onScaleStart: (details) {
      _previousScale = _scale;
      _controller.reset();
    },
    onScaleUpdate: (details) {
      setState(() {
        _scale = _previousScale * details.scale;
      });
    },
    onScaleEnd: (details) {
      if (_scale > 1.0) {
        _controller.forward();
      } else {
        _controller.reverse();
      }
    },
    child: AnimatedBuilder(
      animation: _controller,
      builder: (BuildContext context, Widget child) {
        return Transform.scale(
          scale: _scale,
          child: child,
        );
      },
      child: YourAnimatedWidget(),
    ),
  );
}