Highlight constrained text by gave color (enable by symbols)

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Tue Sep 03 2024 09:19:58 GMT+0000 (Coordinated Universal Time)

Saved by @Samuel1347 #flutter #dart

import 'package:flutter/material.dart';

class HighlightTextSearch extends StatelessWidget {
  final String data;
  final String? searchText;
  final bool enable;
  final TextStyle style;
  final Color highlightColor;

  const HighlightTextSearch({
    super.key,
    this.searchText,
    this.enable = true,
    required this.data,
    required this.style,
    this.highlightColor = Colors.amber,
  });

  @override
  Widget build(BuildContext context) {
    if (searchText == null || searchText!.isEmpty && enable == true) {
      return Text(
        data,
        style: style,
        overflow: TextOverflow.ellipsis,
        maxLines: 1,
      );
    }

    final lowerCaseUserName = data.toLowerCase();
    final lowerCaseSearchText = searchText!.toLowerCase();
    final highlightedSpans = <TextSpan>[];

    int start = 0;
    while (start < lowerCaseUserName.length) {
      final index = lowerCaseUserName.indexOf(lowerCaseSearchText, start);
      if (index == -1) {
        highlightedSpans.add(TextSpan(
          text: data.substring(start),
          style: style,
        ));
        break;
      }

      if (index > start) {
        highlightedSpans.add(TextSpan(
          text: data.substring(start, index),
          style: style,
        ));
      }

      highlightedSpans.add(TextSpan(
        text: data.substring(index, index + lowerCaseSearchText.length),
        style: style.copyWith(color: highlightColor),
      ));

      start = index + lowerCaseSearchText.length;
    }

    return RichText(
      text: TextSpan(
        children: highlightedSpans,
      ),
      overflow: TextOverflow.ellipsis,
      maxLines: 1,
    );
  }
}

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