textSpan static method

Implementation

static List<TextSpan> textSpan(
  BuildContext context,
  bool isSelf,
  String text,
  int start, {
  int? end,
  ChatUIConfig? chatUIConfig,
  Map<String, dynamic>? remoteExtension,
}) {
  //定义文本字体大小和颜色
  final textSize = (isSelf
          ? chatUIConfig?.sendMessageTextSize
          : chatUIConfig?.receiveMessageTextSize) ??
      16;
  final textColor = (isSelf
          ? chatUIConfig?.sendMessageTextColor
          : chatUIConfig?.receiveMessageTextColor) ??
      CommonColors.color_333333;
  final textAitColor =
      chatUIConfig?.messageLinkColor ?? CommonColors.color_007aff;

  //需要返回的spans
  final List<TextSpan> spans = [];
  //如果有@消息，则需要将@消息的文本和普通文本分开
  if (remoteExtension?[ChatMessage.keyAitMsg] != null) {
    //获取@消息的文本list
    List<AitItemModel> aitSegments = [];
    //将所有@的文本和位置提取出来
    try {
      var aitMap = remoteExtension![ChatMessage.keyAitMsg] as Map;
      final AitContactsModel aitContactsModel = AitContactsModel.fromMap(
        Map<String, dynamic>.from(aitMap),
      );
      aitContactsModel.aitBlocks.forEach((key, value) {
        var aitMsg = value as AitMsg;
        aitMsg.segments.forEach((segment) {
          aitSegments.add(AitItemModel(key, aitMsg.text, segment));
        });
      });
    } catch (e) {
      Alog.e(
        tag: 'ChatKitMessageTextItem',
        content: 'aitContactsModel.fromMap error: $e',
      );
    }
    //如果没有解析到@消息，则直接返回
    if (aitSegments.isEmpty) {
      spans.add(
        TextSpan(
          text: text,
          style: TextStyle(fontSize: textSize, color: textColor),
        ),
      );
      return spans;
    }

    //根据@消息的位置，将文本分成多个部分
    aitSegments.sort((a, b) => a.segment.start.compareTo(b.segment.start));
    int preIndex = start;
    for (var aitItem in aitSegments) {
      if (preIndex > aitItem.segment.endIndex) {
        continue;
      }
      //@之前的部分
      if (preIndex < text.length && aitItem.segment.start > preIndex) {
        spans.add(
          TextSpan(
            text: text.substring(
              preIndex,
              min(aitItem.segment.start, text.length),
            ),
            style: TextStyle(fontSize: textSize, color: textColor),
          ),
        );
      }
      //@部分
      if (end == null) {
        spans.add(
          TextSpan(
            text: aitItem.text,
            style: TextStyle(fontSize: textSize, color: textAitColor),
            recognizer: TapGestureRecognizer()
              ..onTap = () {
                //点击@消息，如果有自定义回调，则回调，否则跳转到用户详情页
                if (chatUIConfig?.onTapAitLink != null) {
                  chatUIConfig?.onTapAitLink?.call(
                    aitItem.account,
                    aitItem.text,
                  );
                } else if (aitItem.account != AitContactsModel.accountAll) {
                  if (IMKitClient.account() != aitItem.account) {
                    goToContactDetail(context, aitItem.account);
                  } else {
                    gotoMineInfoPage(context);
                  }
                }
              },
          ),
        );
        preIndex = aitItem.segment.endIndex;
      } else if (aitItem.segment.start < end) {
        spans.add(
          TextSpan(
            text: aitItem.text,
            style: TextStyle(fontSize: textSize, color: textAitColor),
            recognizer: TapGestureRecognizer()
              ..onTap = () {
                //点击@消息，如果有自定义回调，则回调，否则跳转到用户详情页
                if (chatUIConfig?.onTapAitLink != null) {
                  chatUIConfig?.onTapAitLink?.call(
                    aitItem.account,
                    aitItem.text,
                  );
                } else if (aitItem.account != AitContactsModel.accountAll) {
                  if (IMKitClient.account() != aitItem.account) {
                    goToContactDetail(context, aitItem.account);
                  } else {
                    gotoMineInfoPage(context);
                  }
                }
              },
          ),
        );
        preIndex = aitItem.segment.endIndex;
      }
    }
    //最后一个@之后的部分
    final lastStartIndex = preIndex - start;
    if (lastStartIndex < text.length - 1) {
      spans.add(
        TextSpan(
          text: text.substring(lastStartIndex, text.length),
          style: TextStyle(fontSize: textSize, color: textColor),
        ),
      );
    }
  } else {
    //没有@消息，直接返回
    spans.add(
      TextSpan(
        text: text,
        style: TextStyle(fontSize: textSize, color: textColor),
      ),
    );
  }
  return spans;
}