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

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Mirror.Examples.Chat
+{
+    public class ChatUI : NetworkBehaviour
+    {
+        [Header("UI Elements")]
+        [SerializeField] Text chatHistory;
+        [SerializeField] Scrollbar scrollbar;
+        [SerializeField] InputField chatMessage;
+        [SerializeField] Button sendButton;
+
+        // This is only set on client to the name of the local player
+        internal static string localPlayerName;
+
+        // Server-only cross-reference of connections to player names
+        internal static readonly Dictionary<NetworkConnectionToClient, string> connNames = new Dictionary<NetworkConnectionToClient, string>();
+
+        public override void OnStartServer()
+        {
+            connNames.Clear();
+        }
+
+        public override void OnStartClient()
+        {
+            chatHistory.text = "";
+        }
+
+        [Command(requiresAuthority = false)]
+        void CmdSend(string message, NetworkConnectionToClient sender = null)
+        {
+            if (!connNames.ContainsKey(sender))
+                connNames.Add(sender, sender.identity.GetComponent<Player>().playerName);
+
+            if (!string.IsNullOrWhiteSpace(message))
+                RpcReceive(connNames[sender], message.Trim());
+        }
+
+        [ClientRpc]
+        void RpcReceive(string playerName, string message)
+        {
+            string prettyMessage = playerName == localPlayerName ?
+                $"<color=red>{playerName}:</color> {message}" :
+                $"<color=blue>{playerName}:</color> {message}";
+            AppendMessage(prettyMessage);
+        }
+
+        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;
+        }
+
+        // Called by UI element ExitButton.OnClick
+        public void ExitButtonOnClick()
+        {
+            // StopHost calls both StopClient and StopServer
+            // StopServer does nothing on remote clients
+            NetworkManager.singleton.StopHost();
+        }
+
+        // Called by UI element MessageField.OnValueChanged
+        public void ToggleButton(string input)
+        {
+            sendButton.interactable = !string.IsNullOrWhiteSpace(input);
+        }
+
+        // Called by UI element MessageField.OnEndEdit
+        public void OnEndEdit(string input)
+        {
+            if (Input.GetKeyDown(KeyCode.Return) || Input.GetKeyDown(KeyCode.KeypadEnter) || Input.GetButtonDown("Submit"))
+                SendMessage();
+        }
+
+        // Called by OnEndEdit above and UI element SendButton.OnClick
+        public void SendMessage()
+        {
+            if (!string.IsNullOrWhiteSpace(chatMessage.text))
+            {
+                CmdSend(chatMessage.text.Trim());
+                chatMessage.text = string.Empty;
+                chatMessage.ActivateInputField();
+            }
+        }
+    }
+}