import 'package:flutter/material.dart'; @immutable class CustomTitleBar extends StatelessWidget with PreferredSizeWidget { const CustomTitleBar({ Key? key, required this.title, required this.showBack, this.rightHandButton, this.backgroundColor, }) : super(key: key); final Text title; final bool showBack; final IconButton? rightHandButton; final Color? backgroundColor; @override Size get preferredSize => const Size.fromHeight(kToolbarHeight); @override Widget build(BuildContext context) { return AppBar( elevation: 0, automaticallyImplyLeading: false, backgroundColor: backgroundColor != null ? backgroundColor! : Theme.of(context).appBarTheme.backgroundColor, flexibleSpace: SafeArea( child: Container( padding: const EdgeInsets.only(right: 16), child: Row( children: [ showBack ? _backButton(context) : const SizedBox.shrink(), showBack ? const SizedBox(width: 2,) : const SizedBox(width: 15), Expanded( child: Column( crossAxisAlignment: CrossAxisAlignment.start, mainAxisAlignment: MainAxisAlignment.center, children: [ title, ], ), ), rightHandButton != null ? rightHandButton! : const SizedBox.shrink(), ], ), ), ), ); } Widget _backButton(BuildContext context) { return IconButton( onPressed: (){ Navigator.pop(context); }, icon: Icon( Icons.arrow_back, color: Theme.of(context).appBarTheme.iconTheme?.color, ), ); } }