有没有办法让tab栏指示器线成为flutter中的渐变？

import 'package:flutter/material.dart';

class GradientTabIndicator extends Decoration {
  @override
  BoxPainter createBoxPainter([VoidCallback? onChanged]) {
    return _GradientPainter();
  }
}

class _GradientPainter extends BoxPainter {
  @override
  void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) {
    final Rect rect = offset & configuration.size!;
    final Paint paint = Paint()
      ..shader = LinearGradient(
        colors: [Colors.red, Colors.blue],
        begin: Alignment.centerLeft,
        end: Alignment.centerRight,
      ).createShader(rect);

    canvas.drawRect(rect, paint);
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('Gradient Tab Indicator'),
      ),
      body: DefaultTabController(
        length: 3,
        child: Column(
          children: [
            TabBar(
              indicator: GradientTabIndicator(), // 使用自定义的渐变指示器
              tabs: [
                Tab(text: 'Tab 1'),
                Tab(text: 'Tab 2'),
                Tab(text: 'Tab 3'),
              ],
            ),
            Expanded(
              child: TabBarView(
                children: [
                  Center(child: Text('Content 1')),
                  Center(child: Text('Content 2')),
                  Center(child: Text('Content 3')),
                ],
              ),
            ),
          ],
        ),
      ),
    ),
  ));
}