todos-contra-el-fuego-mobile/lib/customBottomAppBar.dart

import 'package:flutter/material.dart';

class CustomBottomAppBar extends StatelessWidget {
  const CustomBottomAppBar(
      {super.key, this.fabLocation,
      this.showNotch = false,
      this.height = 56.0,
      this.color = Colors.black45,
      this.mainAxisAlignment = MainAxisAlignment.center,
      this.actions = const <Widget>[]});

  final Color color;
  final double height;
  final MainAxisAlignment mainAxisAlignment;
  final FloatingActionButtonLocation? fabLocation;
  final bool showNotch;
  final List<Widget> actions;

  static final List<FloatingActionButtonLocation> kCenterLocations =
      <FloatingActionButtonLocation>[
    FloatingActionButtonLocation.centerDocked,
    FloatingActionButtonLocation.centerFloat,
  ];

  @override
  Widget build(BuildContext context) {
    final List<Widget> rowContents = <Widget>[SizedBox(height: height)];

    if (kCenterLocations.contains(fabLocation)) {
      /* rowContents.add(
        const Expanded(child: const SizedBox()),
      ); */
    }

    rowContents.addAll(actions);

    return showNotch
        ? BottomAppBar(
            color: color,
            shape: const CircularNotchedRectangle(),
            child: Row(
                mainAxisAlignment: mainAxisAlignment, children: rowContents),
          )
        : BottomAppBar(
            color: color,
            child: Row(
                mainAxisAlignment: mainAxisAlignment, children: rowContents),
          );
  }
}