如何创建这样的动画和用户界面

Question

创建这样的用户界面和动画
这是链接，请帮助link

Dismissible(
    resizeDuration: null,
    onDismissed: (DismissDirection direction) {
      setState(() {
        _counter += direction == DismissDirection.endToStart ? 1 : -1;
      });
    },
    key: new ValueKey(_counter),
    child: new Center(
      child: Container(
        width: double.infinity,
        color: Colors.redAccent,
        child: SizedBox(
          width: double.maxFinite,
          child: Padding(
            padding: EdgeInsets.fromLTRB(150, 0.0, 150.0, 0.0),
            child: new Text(
              '$_counter',
              style: Theme.of(context).textTheme.display4,

我做了这件事