Custom AppBar.dart

import 'package:flutter/material.dart';
import 'package:ursakta_mig/views/ticketsView.dart';

class CustomAppBar extends StatelessWidget implements PreferredSizeWidget {
  final double avatarSize = 24;

  @override
  Widget build(BuildContext _) {
    return AppBar(
      elevation: 0,
      backgroundColor: Colors.transparent,
      actions: <Widget>[
        GestureDetector(
          onTap: () => Navigator.pushNamed(_, TicketsView().label),
          child: Center(
            child: Container(
              margin: EdgeInsets.only(right: 16),
              height: avatarSize,
              width: avatarSize,
              decoration: BoxDecoration(
                  color: Colors.red.withOpacity(.1),
                  borderRadius: BorderRadius.circular(avatarSize)),
              child: Icon(
                Icons.person,
                color: Colors.red,
              ),
            ),
          ),
        ),
      ],
    );
  }

  @override
  Size get preferredSize {
    return new Size.fromHeight(48.0);
  }
}