buildSearchSpan function

Implementation

Widget buildSearchSpan(String content, String searchText,
    {Color searchTextColor = Colors.red,
    TextStyle style = const TextStyle(color: Colors.black)}) {
  int startIndex = content.indexOf(searchText);
  int endIndex = -1;
  if (startIndex > -1) {
    endIndex = startIndex + searchText.length;
    return RichText(
        text: TextSpan(
            text: content.substring(0, startIndex),
            style: style,
            children: [
          TextSpan(
              //获取剩下的字符串，并让它变成灰色
              text: searchText,
              style: style.copyWith(color: searchTextColor)),
          TextSpan(
              //获取剩下的字符串，并让它变成灰色
              text: content.substring(endIndex),
              style: style)
        ]));
  } else {
    return Text(content, maxLines: null, style: style);
  }
}