flutter_server_box/lib/view/widget/omit_start_text.dart

import 'package:flutter/material.dart';

class OmitStartText extends StatelessWidget {
  final String text;
  final int? maxLines;
  final TextStyle? style;
  final TextOverflow? overflow;

  const OmitStartText(this.text, {super.key, this.maxLines, this.style, this.overflow});

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, size) {
        bool exceeded = false;
        int len = 0;
        for (; !exceeded && len < text.length; len++) {
          // Build the textspan
          final span = TextSpan(
            text: 'A' * 7 + text.substring(text.length - len),
            style: style ?? Theme.of(context).textTheme.bodyMedium,
          );

          // Use a textpainter to determine if it will exceed max lines
          final tp = TextPainter(maxLines: maxLines ?? 1, textDirection: TextDirection.ltr, text: span);

          // trigger it to layout
          tp.layout(maxWidth: size.maxWidth);

          // whether the text overflowed or not
          exceeded = tp.didExceedMaxLines;
        }

        return Text(
          (exceeded ? '...' : '') + text.substring(text.length - len),
          overflow: overflow ?? TextOverflow.fade,
          softWrap: false,
          maxLines: maxLines ?? 1,
          style: style,
        );
      },
    );
  }
}