highLightClickableRichText method

Text highLightClickableRichText({
  1. required List<String> keywords,
  2. Color textColor = Colors.black,
  3. Color highColor = Colors.blue,
  4. double fontSize = 12,
  5. double? keywordFontSize,
  6. FontWeight fontWeight = FontWeight.normal,
  7. FontWeight? keywordFontWeight,
  8. void onKeywordTap(
    1. String keyword
    )?,
})

根据关键字创建关键字高亮可点击的富文本widget keywords 需要高亮可点击的关键字列表 textColor 文本颜色，默认是黑色 highColor 高亮文本颜色，默认是蓝色 fontSize 文本的大小，默认是12 keywordFontSize 高亮文本大小，默认是fontSize大小 fontWeight 文本的字体权重，默认是FontWeight.normal keywordFontWeight 高亮文本的字体权重，默认是fontWeight onKeywordTap 高亮文本点击方法回调

Implementation

Text highLightClickableRichText(
    {required List<String> keywords,
    Color textColor = Colors.black,
    Color highColor = Colors.blue,
    double fontSize = 12,
    double? keywordFontSize,
    FontWeight fontWeight = FontWeight.normal,
    FontWeight? keywordFontWeight,
    void Function(String keyword)? onKeywordTap}) {
  keywordFontSize = keywordFontSize ?? fontSize;
  keywordFontWeight = keywordFontWeight ?? fontWeight;

  List<TextSpan> textSpanList = [];
  List<_KeyWordIndex> keywordIndexList = [];

  // 找到所有关键字的下标
  for (var keyword in keywords) {
    keywordIndexList.addAll(_indexOfList(keyword));
  }

  // 下标升序排序
  keywordIndexList.sort((a, b) {
    return a.index.compareTo(b.index);
  });

  int startIndex = 0;
  for (var keywordIndex in keywordIndexList) {
    var normalText = substring(startIndex, keywordIndex.index);
    textSpanList.add(TextSpan(
        text: normalText,
        style: TextStyle(
            color: textColor, fontWeight: fontWeight, fontSize: fontSize)));

    var keyword = keywordIndex.keyword;

    TapGestureRecognizer? recognizer = onKeywordTap == null
        ? null
        : (TapGestureRecognizer()
          ..onTap = () {
            onKeywordTap(keyword);
          });

    textSpanList.add(TextSpan(
        text: keyword,
        style: TextStyle(
            color: highColor,
            fontWeight: keywordFontWeight,
            fontSize: keywordFontSize),
        recognizer: recognizer));

    startIndex = startIndex + normalText.length + keywordIndex.keyword.length;
  }

  if (startIndex < length) {
    var normalText = substring(startIndex, length);
    textSpanList.add(TextSpan(
        text: normalText,
        style: TextStyle(
            color: textColor, fontWeight: fontWeight, fontSize: fontSize)));
  }

  return Text.rich(
      textAlign: TextAlign.left, TextSpan(children: textSpanList));
}