Avalonia 实现聊天消息渲染、图文混排（支持Windows、Linux、信创国产OS）

   　　　/// <summary>
        /// 渲染名片 
        /// </summary>
        /// <param name="msgID">聊天记录ID</param>
        /// <param name="userID">发送者</param>
        /// <param name="cardUserID">名片上的个人ID</param>
        /// <param name="index">插入聊天记录的位置，默认是放到最后面</param>
        void AddChatItemCard(string msgID ,string userID, string cardUserID ,int? index = null);

        /// <summary>
        /// 渲染文件 
        /// </summary> 
        /// <param name="fileName">文件名称</param>
        /// <param name="fileSize">文件大小</param>
        /// <param name="state">文件状态</param> 
        void AddChatItemFile(string msgID, string userID, string fileName, ulong fileSize, FileTransState state, int? index = null);

        /// <summary>
        /// 渲染图片
        /// </summary> 
        /// <param name="image">图像</param>
        /// <param name="imgSize">图像大小</param>
        /// <param name="observerable">默认传null</param> 
        void AddChatItemImage(string msgID, string userID, object image, Size imgSize ,IProgressObserverable observerable = null, int? index = null);

        /// <summary>
        /// 渲染文本表情
        /// </summary> 
        /// <param name="text">内容，在渲染文本的内容中用 [000]来代表第一个表情，[001]即是二个表情，以此类推</param>
        /// <param name="referenced">引用内容可以是文本、图片、文件或名片</param>
        /// <param name="textColor">文字颜色</param> 
        void AddChatItemText(string msgID, string userID, string text, ReferencedChatMessage referenced = null, Color? textColor = null, int? index = null);

        /// <summary>
        /// 渲染悄悄话，默认显示内容—>> 悄悄话
        /// </summary> 
        void AddChatItemSnap(string msgID, string userID, int? index = null);

        /// <summary>
        /// 渲染语音消息
        /// </summary> 
        /// <param name="audioMessageSecs">语音时长</param>
        /// <param name="audioMessage">语音短信</param> 
        void AddChatItemAudio(string msgID, string userID, int audioMessageSecs, object audioMessage, int? index = null);

        /// <summary>
        /// 渲染多媒体通话类型
        /// </summary> 
        /// <param name="duration">通话时长</param>
        /// <param name="isAudioCommunicate">通话类型(语音/视频)</param> 
        void AddChatItemMedia(string msgID, string userID, string duration, bool isAudioCommunicate, int? index = null); 

        /// <summary>
        /// 渲染系统消息
        /// </summary>
        /// <param name="msg">系统消息内容</param> 
        void AddChatItemSystemMessage(string msg, int? index = null);

        /// <summary>
        /// 渲染消息的发送时间
        /// </summary>
        /// <param name="dt">发送时间</param> 
        void AddChatItemTime(DateTime dt, int? index = null);   

        /// <summary>
        /// 自己撤回消息 
        /// </summary> 
        void RecallChatMessage(string msgID);

        /// <summary>
        /// 其他用户撤回消息 
        /// </summary> 
        /// <param name="operatorName">操作者</param>
        void RecallChatMessage(string msgID ,string operatorName);

        /// <summary>
        /// 删除对应的记录
        /// </summary> 
        void RemoveChatMessage(string msgID);

        /// <param name="provider">提供必要的信息给聊天渲染器</param>
        /// <param name="ctrl">要在其表面渲染的UI控件</param>
        /// <param name="myID">自己的ID</param>
        /// <param name="destID">对方ID、或群ID</param>
        /// <param name="isGroup">群聊/单聊</param>
        /// <returns></returns>
        public static IChatRender CreateChatRender(ISysRender sysRender,IRenderDataProvider provider, IChatControl ctrl, string myID, string destID, bool isGroup);       

        /// <summary>
        /// 插入要渲染的自定义消息。
        /// </summary>       
        void AddChatItemCustomized(IChatItem item, int? index = null);