FloatBuilder typedef
FloatBuilder =
Widget Function(StateSetter setter, State<_FFloatContent> contentState)
用于返回一个 Widget,如果只更新内容区域的话,通过 setter((){}) 进行
Used to return a Widget, if only the content area is updated, through setter (() {})
Implementation
typedef FloatBuilder = Widget Function(StateSetter setter, State<_FFloatContent> contentState);