location2025/lib/widget/marquee_text.dart

import 'package:flutter/cupertino.dart';
import 'package:marquee/marquee.dart';

class MarqueeText extends StatelessWidget {
  final String text;
  final TextStyle textStyle;
  final double velocity;
  final double blankSpace;

  const MarqueeText({
    super.key,
    required this.text,
    required this.textStyle,
    this.velocity = 18.0,
    this.blankSpace = 20.0,
  });

  Size _calculateTextSize(String text, TextStyle style) {
    final TextPainter textPainter = TextPainter(
      text: TextSpan(text: text, style: style),
      maxLines: 1,
      textDirection: TextDirection.ltr,
    )..layout(minWidth: 0, maxWidth: double.infinity);
    return textPainter.size;
  }

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final maxWidth = constraints.maxWidth; // 👈 父级能给的剩余宽度
        final textWidth = _calculateTextSize(text, textStyle).width;

        if (textWidth <= maxWidth) {
          return Text(
            text,
            style: textStyle,
            maxLines: 1,
            overflow: TextOverflow.ellipsis,
          );
        } else {
          return SizedBox(
            width: maxWidth,
            child: Marquee(
              text: text,
              style: textStyle,
              blankSpace: blankSpace,
              pauseAfterRound: const Duration(seconds: 2),
              velocity: velocity,
            ),
          );
        }
      },
    );
  }
}