pad Extension

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: Scaffold(
        body: Center(
          child: Row(children: [
            Container(
              color: Colors.red,
              width: 100,
              height: 100,
            ).pad(all: 16),
            Container(
              color: Colors.orange,
              width: 100,
              height: 100,
            ).pad(symmetric: (16, 16)),
            Container(
              color: Colors.purple,
              width: 100,
              height: 100,
            ).pad(ltrb: (16, 16, 16, 16))
          ]),
        ),
      ),
    ),
  );
}

extension WidgetExtensions on Widget {
  Padding pad({
    double? all,
    (double left, double top, double right, double bottom)? ltrb,
    (double horizontal, double vertical)? symmetric,
    Key? key,
  }) =>
      Padding(
        padding: all != null
            //all
            ? EdgeInsets.all(all)
            //LTRB
            : ltrb != null
                ? EdgeInsets.fromLTRB(ltrb.$1, ltrb.$2, ltrb.$3, ltrb.$4)
                : symmetric != null
                    //Symmetric
                    ? EdgeInsets.symmetric(
                        horizontal: symmetric.$1, vertical: symmetric.$2)
                    //None
                    : EdgeInsets.zero,
        key: key,
        child: this,
      );
}