Flutter Custom Button Widget

We will create a custom button which will take string, icon, onPress event and fontSize. But our will have default values for string, icon, onPress event and fontSize.

void main() async {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primaryColor: Colors.blue,
        fontFamily: "Lato",
      ),
      home: Scaffold(
        backgroundColor: Colors.white,
        body: Center(
          child: CustomButton(buttonText: 'test', fontSize: 16, icon: Icons.person_outline,
            
          ),
        ),
      ),
    );
  }
}
class CustomButton extends StatelessWidget {
  final VoidCallback? onPressed;
  final String buttonText;
  final bool transparent;
   EdgeInsets? margin;
  final double? height;
  final double? width;
  final double? fontSize;
  final double radius;
  final IconData? icon;
  CustomButton({ this.onPressed, required this.buttonText, this.transparent = false, this.margin, this.width, this.height,
     this.fontSize, this.radius = 5,  this.icon});

  @override
  Widget build(BuildContext context) {
    final ButtonStyle _flatButtonStyle = TextButton.styleFrom(
      backgroundColor: onPressed == null ? Theme.of(context).disabledColor : transparent
          ? Colors.transparent : Theme.of(context).primaryColor,
      minimumSize: Size(width ?? 1200,
          height ?? 50),
      padding: EdgeInsets.zero,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(radius),
      ),
    );

    return Center(child: SizedBox(width: width != null ? width : 1200, child: Padding(
      padding: margin ?? EdgeInsets.all(0) ,
      child: TextButton(
        onPressed: onPressed,
        style: _flatButtonStyle,
        child: Row(mainAxisAlignment: MainAxisAlignment.center, children: [
          icon != null ? Padding(
            padding: EdgeInsets.only(right: 5),
            child: Icon(icon, color: transparent ? Theme.of(context).primaryColor : Theme.of(context).cardColor),
          ) : SizedBox(),
          Text(buttonText ??'', textAlign: TextAlign.center, style: TextStyle(
            color: transparent ? Theme.of(context).primaryColor : Theme.of(context).cardColor,
            fontSize: fontSize != null ? fontSize : 20,
          )),
        ]),
      ),
    )));
  }
}