Flutter：从扩展小部件创建自定义小部件

Question

如何创建自定义小部件来扩展现有小部件，使其具有相同的参数但具有一些不同的默认值？

class CustomRaisedButton extends RaisedButton {
  final ShapeBorder shape;
  final double elevation;

  CutstomRaisedButton({this.shape = RoundedRectangleBorder(borderRadius: BorderRadius.circular(25)), this.elevation = 16})
}

Answer 1

应该创建一个自定义的无状态小部件，returns 您想要的按钮。传递一个 'OnPressed' 函数，以便您可以处理主页上的按钮按下！

class CustomRaisedButton extends StatelessWidget {
   CustomRaisedButton({this.onPressed});

   final Function onPressed;

   @override
   Widget build(BuildContext context) {
       return RaisedButton(
            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(25)),
           elevation: 16,
           onPressed: onPressed,
       );
    }
}