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class RightView extends StatelessWidget {
  String title;
  VoidCallback rightClick;

  RightView({this.title, this.rightClick});

  @override
  Widget build(BuildContext context) {
    var containView;
    if (title != Null) {
      containView = new Container(
        alignment: Alignment.center,
        padding: EdgeInsets.all(10.0),
        child: GestureDetector(
          child: Text(
            this.title,
            style: TextStyle(color: Colors.white, fontSize: 18.0),
          ),
          onTap: this.rightClick,
        ),
      );
    } else {
      containView = Text("");
    }
    return containView;
  }
}

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new RightView(
  title: "数据",
  rightClick: () {
    print("点我干什么");
  },
);