feat: Chat example (#1305)

* Add chat example

* Update Assets/Mirror/Examples/Chat/Scripts/ChatNetworkManager.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/Player.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/ChatWindow.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/Player.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/Player.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/Player.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Change package to chat

* Update Assets/Mirror/Examples/Chat/Scripts/ChatNetworkManager.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/ChatNetworkManager.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/ChatNetworkManager.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/ChatNetworkManager.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* Update Assets/Mirror/Examples/Chat/Scripts/ChatWindow.cs

Co-Authored-By: MrGadget <chris@clevertech.net>

* UI FIxes

* Lighting

* Fixed ScrollView

* Fixed username assignment

* removed commented line

* Layout refinement

* remove empty lines

Co-Authored-By: MrGadget <chris@clevertech.net>

* fixed which element was enabled

* Strip unprintable characters

* reverted ASCI filter

Co-authored-by: MrGadget <chris@clevertech.net>

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Assets/Mirror/Examples/Chat/Scripts/ChatNetworkManager.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Mirror;
+using System;
+
+namespace Mirror.Examples.Chat
+{
+    public class ChatNetworkManager : NetworkManager
+    {
+        public string playerName { get; set; }
+
+        public void SetHostname(string hostname)
+        {
+            this.networkAddress = hostname;
+        }
+
+        public ChatWindow chatWindow;
+
+        public class CreatePlayerMessage: MessageBase
+        {
+            public string name;
+        }
+
+        public override void OnStartServer()
+        {
+            base.OnStartServer();
+            NetworkServer.RegisterHandler<CreatePlayerMessage>(OnCreatePlayer);
+        }
+
+        public override void OnClientConnect(NetworkConnection conn)
+        {
+            base.OnClientConnect(conn);
+
+            // tell the server to create a player with this name
+            conn.Send(new CreatePlayerMessage
+            {
+                name = playerName
+            });
+        }
+
+        private void OnCreatePlayer(NetworkConnection connection, CreatePlayerMessage createPlayerMessage)
+        {
+            // create a gameobject using the name supplied by client
+            GameObject playergo = Instantiate(playerPrefab);
+            playergo.GetComponent<Player>().playerName = createPlayerMessage.name;
+
+            // set it as the player
+            NetworkServer.AddPlayerForConnection(connection, playergo);
+        }
+    }
+}

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Assets/Mirror/Examples/Chat/Scripts/ChatWindow.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Mirror.Examples.Chat
+{
+    public class ChatWindow : MonoBehaviour
+    {
+        public InputField chatMessage;
+        public Text chatHistory;
+        public Scrollbar scrollbar;
+
+        public void OnSend()
+        {
+            if (chatMessage.text.Trim() == "") return;
+
+            // get our player
+            Player player = NetworkClient.connection.identity.GetComponent<Player>();
+
+            // send a message
+            player.CmdSend(chatMessage.text.Trim());
+
+            chatMessage.text = "";
+        }
+
+        internal void AppendMessage(string message)
+        {
+            StartCoroutine(AppendAndScroll(message));
+        }
+
+        IEnumerator AppendAndScroll(string message)
+        {
+            chatHistory.text += message + "\n";
+            
+            // it takes 2 frames for the UI to update ?!?!
+            yield return null;
+            yield return null;
+
+            // slam the scrollbar down
+            scrollbar.value = 0;
+        }
+    }
+}

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Assets/Mirror/Examples/Chat/Scripts/Player.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Mirror.Examples.Chat
+{
+    public class Player : NetworkBehaviour
+    {
+        [SyncVar]
+        public string playerName;
+
+        public ChatWindow chatWindow => ((ChatNetworkManager)NetworkManager.singleton).chatWindow;
+
+        [Command]
+        public void CmdSend(string message)
+        {
+            if (message.Trim() != "")
+                RpcReceive(message.Trim());
+        }
+
+        public override void OnStartLocalPlayer()
+        {
+            chatWindow.gameObject.SetActive(true);
+        }
+
+        [ClientRpc]
+        public void RpcReceive(string message)
+        {
+            string prettyMessage = isLocalPlayer ?
+                $"<color=red>{playerName}: </color> {message}" :
+                $"<color=blue>{playerName}: </color> {message}";
+            
+            chatWindow.AppendMessage(prettyMessage);
+
+            Debug.Log(message);
+        }
+    }
+}

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