Flutter 我想在文本结束后显示分隔线.它会在第一行、第二行或第三行结束

我能够达到所需的结果.

main.dart:

import 'package:flutter/material.dart';
import 'package:test_flutter/divider_text.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Text Test',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  static const TextStyle textStyle = TextStyle(fontSize: 32);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Text Test'),
      ),
      body: Column(
        children: [
          const DividerText(
            'Title',
            style: textStyle,
            indent: 4.0,
            endIndent: 4.0,
            dividerThickness: 2.0,
          ),
          const SizedBox(height: 64.0),
          DividerText(
            'Title' * 100,
            style: textStyle,
            indent: 4.0,
            endIndent: 4.0,
            dividerThickness: 2.0,
          ),
        ],
      ),
    );
  }
}

divider_text.dart:

import 'package:flutter/material.dart';

class DividerText extends StatelessWidget {
  const DividerText(this.text, {
    super.key,
    this.width,
    this.style,
    this.indent,
    this.endIndent,
    this.dividerThickness,
    this.dividerColor,
  });

  final double? width;
  final String text;
  final TextStyle? style;
  final double? indent;
  final double? endIndent;
  final double? dividerThickness;
  final Color? dividerColor;

  @override
  Widget build(BuildContext context) {
    var screenWidth = width ?? MediaQuery.of(context).size.width;
    var textInfo = (TextPainter(
      text: TextSpan(text: text, style: style),
      textScaleFactor: MediaQuery.of(context).textScaleFactor,
      textDirection: TextDirection.ltr,
    )..layout(maxWidth: screenWidth)).computeLineMetrics().last;
    var lastWidth = textInfo.width % screenWidth;
    var dividerWidth = screenWidth - lastWidth;
    return SizedBox(
      width: screenWidth,
      height: textInfo.height * (textInfo.lineNumber + 1),
      child: Stack(
        children: [
          Align(
            alignment: Alignment.bottomRight,
            child: SizedBox(
              width: dividerWidth,
              child: Divider(
                height: textInfo.height,
                thickness: dividerThickness ?? 1.0,
                indent: indent,
                endIndent: endIndent,
                color: dividerColor ?? style?.color ?? DefaultTextStyle.of(context).style.color,
              ),
            ),
          ),
          Text(text, style: style),
        ],
      ),
    );
  }
}

Here's the screenshot: