import 'package:flutter/material.dart'; import 'package:flutter/services.dart'; class MuyuAppBar extends StatelessWidget implements PreferredSizeWidget { final VoidCallback onTapHistory; const MuyuAppBar({ Key? key, required this.onTapHistory, }) : super(key: key); @override Widget build(BuildContext context) { return AppBar( title: const Text("电子木鱼"), actions: [ IconButton( onPressed: onTapHistory, icon: const Icon(Icons.history), ) ], ); } @override Size get preferredSize => const Size.fromHeight(kToolbarHeight); }