onMessageRevoked method

Future<NIMResult<NIMMessage>> onMessageRevoked(ChatMessage revokedMsg, String revokedMsgContent)

Implementation

Future<NIMResult<NIMMessage>> onMessageRevoked(
    ChatMessage revokedMsg, String revokedMsgContent) async {
  //消息不准确，这种消息是离线时SDK返回的，但是iOS没有，所以统一不展示
  if (revokedMsg.nimMessage.fromAccount != IMKitClient.account() &&
      revokedMsg.nimMessage.messageDirection ==
          NIMMessageDirection.outgoing) {
    return NIMResult.failure(message: 'message error');
  }

  RevokedMessageInfo? revokedMessageInfo =
      RevokedMessageInfo.getRevokedMessage(revokedMsg.nimMessage);
  //创建一条特殊的占位消息
  final msgResult = await MessageBuilder.createTextMessage(
      sessionId: revokedMsg.nimMessage.sessionId!,
      sessionType: revokedMsg.nimMessage.sessionType!,
      text: revokedMsgContent);
  if (msgResult.isSuccess && msgResult.data != null) {
    //设置撤回标识
    if (msgResult.data!.localExtension != null) {
      msgResult.data!.localExtension![ChatMessage.keyRevokeMsg] = true;
      msgResult.data!.localExtension![ChatMessage.keyRevokeMsgContent] =
          revokedMessageInfo?.toMap();
    } else {
      msgResult.data!.localExtension = {
        ChatMessage.keyRevokeMsg: true,
        ChatMessage.keyRevokeMsgContent: revokedMessageInfo?.toMap()
      };
    }
    msgResult.data!.config = NIMCustomMessageConfig(enableUnreadCount: false);
    msgResult.data!.fromAccount = revokedMsg.nimMessage.fromAccount;
    msgResult.data!.messageDirection =
        revokedMsg.nimMessage.fromAccount == IMKitClient.account()
            ? NIMMessageDirection.outgoing
            : NIMMessageDirection.received;
    //将占位消息插入到本地
    return NimCore.instance.messageService.saveMessageToLocalEx(
        message: msgResult.data!, time: revokedMsg.nimMessage.timestamp);
  }
  return NIMResult.failure(message: 'build message error');
}