huixiang_app/lib/im/database/message.dart

import 'dart:math';

class Message {
  int id;

  String conversationId;

  String fromId;

  String toId;

  String replyId;

  String content;

  String attach;

  int msgType;

  String time;

  /// 0 unread, 1 read, 2
  int state;

  int isDelete;

  bool showTime = false;

  Message(this.id, this.conversationId, this.fromId, this.toId, this.replyId, this.content, this.attach, this.msgType, this.time, this.state, this.isDelete);

  factory Message.fromJson(Map<String, dynamic> json) => Message(
      json["id"],
      json["conversationId"],
      json["fromId"],
      json["toId"],
      json["replyId"],
      json["content"],
      json["attach"],
      json["msgType"],
      json["time"],
      json["state"],
      json["isDelete"]);

  Map<String, dynamic> toJson() => <String, dynamic>{
        "id": id,
        "conversationId": conversationId,
        "fromId": fromId,
        "toId": toId,
        "replyId": replyId,
        "content": content,
        "attach": attach,
        "msgType": msgType,
        "time": time,
        "state": state,
        "isDelete": isDelete == null ? 0 : isDelete
      };
}

createMessage(var toId, String content, {String attach, int msgType, userId, replyId}) {
  return <String, dynamic>{
    "conversationId": conversationId(userId, toId),
    "fromId": userId,
    "toId": toId,
    "replyId": replyId,
    "content": content,
    "attach": attach,
    "msgType": msgType ?? 1,
    "time": "${DateTime.now().millisecondsSinceEpoch}",
    "state": 0,
    "isDelete": 0
  };
}

conversationId(tid, fid) {
  num itid = num.parse(tid);
  num ifid = num.parse(fid);
  if (itid > ifid) {
    return "$ifid-$itid";
  }
  return "$itid-$ifid";
}