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我没有找到构造函数的任何示例CupertinoFullscreenDialogTransition

https://api.flutter.dev/flutter/cupertino/CupertinoFullscreenDialogTransition-class.html

我试图理解下面的代码，但我没有明白。

CupertinoFullscreenDialogTransition({
  Key key,
  @required Animation<double> animation,
  @required this.child,
}) : _positionAnimation = CurvedAnimation(
       parent: animation,
       curve: Curves.linearToEaseOut,
       // The curve must be flipped so that the reverse animation doesn't play
       // an ease-in curve, which iOS does not use.
       reverseCurve: Curves.linearToEaseOut.flipped,
     ).drive(_kBottomUpTween),
     super(key: key);