import 'package:flutter/material.dart';

class MyAppbar extends StatelessWidget implements PreferredSizeWidget {
  final String title;
  final VoidCallback? onBackPressed;
  final Color backgroundColor;
  final Color textColor;
  final List<Widget>? actions; // 👉 新增参数：右侧按钮

  const MyAppbar({
    Key? key,
    required this.title,
    this.onBackPressed,
    this.backgroundColor = Colors.blue,
    this.textColor = Colors.white,
    this.actions,
  }) : super(key: key);

  @override
  Size get preferredSize => const Size.fromHeight(kToolbarHeight);

  @override
  Widget build(BuildContext context) {
    return AppBar(
      backgroundColor: backgroundColor,
      automaticallyImplyLeading: false,
      centerTitle: true,
      title: Text(
        title,
        style: TextStyle(
          color: textColor,
          fontSize: 18,
          fontWeight: FontWeight.bold,
        ),
      ),
      leading: _buildBackButton(context),
      actions: actions, // 👉 设置右侧按钮
    );
  }

  Widget _buildBackButton(BuildContext context) {
    return IconButton(
      icon: const Icon(Icons.arrow_back_ios, color: Colors.white, size: 20),
      onPressed: onBackPressed ?? () => Navigator.of(context).pop(),
    );
  }
}