如何在flutter中创建一个具有2种颜色的平面按钮？非渐变，2种并排的纯色

import 'package:flutter/material.dart';

class TwoColorButton extends StatelessWidget {
  final Color color1;
  final Color color2;
  final VoidCallback onPressed;

  TwoColorButton({required this.color1, required this.color2, required this.onPressed});

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onPressed,
      child: Container(
        height: 50,
        decoration: BoxDecoration(
          gradient: LinearGradient(
            colors: [color1, color2],
            begin: Alignment.centerLeft,
            end: Alignment.centerRight,
          ),
          borderRadius: BorderRadius.circular(8),
        ),
        child: Center(
          child: Text(
            'Button',
            style: TextStyle(
              color: Colors.white,
              fontSize: 16,
              fontWeight: FontWeight.bold,
            ),
          ),
        ),
      ),
    );
  }
}

TwoColorButton(
  color1: Colors.blue,
  color2: Colors.green,
  onPressed: () {
    // 处理按钮点击事件
  },
)