unity3d中实现聊天功能

using UnityEngine;
using System.Collections;
public class Chat : MonoBehaviour {
        bool usingChat = false;
    bool showChat = false;
    string inputField = "";
    Vector2 scrollposition;
    int width = 500;
    int height = 200;
    string playerName;
    float lastUnfocusTime = 0;
    Rect window;
    ArrayList playerList = new ArrayList();
    class PlayerNode
    {
        public string playerName;
        public NetworkPlayer player;//NetworkPlayer是一个数据结构，保存着你可以从网络定位的另一位玩家的信息。比如，基于NetworkPlayer你可以向另外一个玩家发送消息。
    }
    ArrayList chatEntries=new ArrayList();
    class ChatEntry
    {
        public string name="";
        public string text="";
    }
        // Use this for initialization
        void Start () {
        window = new Rect(Screen.width / 2-width/2,Screen.height-height+5,width,height);
        }
    void OnConnectedToServer()
    {
                playerName = PlayerPrefs.GetString("playerName","");
        if(playerName=="")
        {
            playerName = "RandomName"+Random.Range(1,999);
        }
        ShowChatWindow();
        networkView.RPC("TellServerOurName",RPCMode.Server,playerName);//在所有连接端调用一个RPC函数。
        addGameChatMessage(playerName+" hase just joined the chat!");
    }
    
    void OnServerInitialized()
    {
                playerName = PlayerPrefs.GetString("playerName","");
        if(playerName=="")
        {
            playerName = "RandomName"+Random.Range(1,999);
        }
        ShowChatWindow();
        PlayerNode newEntry =new  PlayerNode();
        newEntry.playerName = playerName;
        newEntry.player = Network.player;
        playerList.Add(newEntry);
        addGameChatMessage(playerName+" hase just joined the chat!");
    }
    PlayerNode GetPlayerNode(NetworkPlayer netPlay)
    { 
        foreach(PlayerNode entry in playerList)
        {
            if(entry.player==netPlay)
            {
                return entry;
            }
           
        }
        Debug.LogError("GetPlayNode:Requested a playernode of non-existing player!");
        return null;
    }
    void OnPlayerDisconnected(NetworkPlayer netPlayer)//当一个玩家从服务器上断开时在服务器端调用。
    {
        addGameChatMessage("A Player has discinnected");
        playerList.Remove(GetPlayerNode(netPlayer));
    }
    void OnDisconnectedFromServer()
    {
        CloseChatWindow();
    }
   
    [RPC]
    void TellServerOurName(string name,NetworkMessageInfo info)//NetworkMessageInfo 网络数据信息,刚从网络接收的数据的相关信息会被保存到这个结构中。它揭示了从哪里来（数据源），什么时间发送和什么网络视图发送；其中包括：数据源、发送时间、网络视图。http://3d.ceeger.com/Script/Netw ... orkMessageInfo.html
    {
        PlayerNode newEntry = new PlayerNode();
        newEntry.playerName = playerName;
        newEntry.player = Network.player;
        playerList.Add(newEntry);
        addGameChatMessage(playerName+" has just joined the chat!");
    }
        void CloseChatWindow()
    {
        showChat = false;
        inputField = "";
        chatEntries = new ArrayList();
    }
        void ShowChatWindow()
    {
        showChat = true;
        inputField = "";
        chatEntries = new ArrayList();
    }
        
        
        void OnGUI () {
        if (!showChat) return;
        if(Event.current.type==EventType.keyDown && Event.current.character=='\n' & inputField.Length<=0)
        {
            if(lastUnfocusTime + .25f < Time.time)
            {
                usingChat = true;
                GUI.FocusWindow(5);
                GUI.FocusControl("Chat input field");
            }
        }
        window = GUI.Window(5,window,GlobalChatWindow,"");
        }
    void GlobalChatWindow(int id)
    {
        GUILayout.BeginVertical();
        GUILayout.Space(10);
        GUILayout.EndVertical();
        scrollposition = GUILayout.BeginScrollView(scrollposition);
        foreach(ChatEntry entry in chatEntries)
        {
            GUILayout.BeginHorizontal();
            if (entry.name == " - ")
            {
                GUILayout.Label(entry.name + entry.text);
            }
            else
            {
                GUILayout.Label(entry.name+": "+entry.text);
            }
            GUILayout.EndHorizontal();
            GUILayout.Space(2);
        }
        GUILayout.EndScrollView();
        if(Event.current.type==EventType.keyDown && Event.current.character=='\n' & inputField.Length>0)
        {
            HitEnter(inputField);
        }
        GUI.SetNextControlName("Chat input field");
        inputField = GUILayout.TextField(inputField);
        if(Input.GetKeyDown("mouse 0"))
        {
            if(usingChat)
            {
                usingChat = false;
                GUI.UnfocusWindow();
                lastUnfocusTime = Time.time;
            }
        } 
    }
        void HitEnter(string msg)
        {
            msg = msg.Replace('\n',' ');
            networkView.RPC("ApplyGlobalChatText",RPCMode.All,playerName,msg);
        }
   [RPC]
    void ApplyGlobalChatText(string name,string msg)
   {
        ChatEntry entry=new ChatEntry();
       entry.name=name;
       entry.text=msg;
       chatEntries.Add(entry);
       if(chatEntries.Count>4)
       {
            chatEntries.RemoveAt(0);
       }
       scrollposition.y=1000000;
       inputField="";
   }
    void addGameChatMessage(string str)
    {
        ApplyGlobalChatText(" - ",str);
        if(Network.connections.Length>0)
        {
            networkView.RPC("ApplyGlobalChatText",RPCMode.Others," - ",str);
        }
    }
}