Add ahelp typing indicator for admins (#19060)

* Add ahelp typing indicator for admins

* Lower typing updates throttle from 3 seconds to 1

* Add stopping typing when sending a message

* Lower typing indicator timeout from 15 to 10 seconds

Content.Client/Administration/UI/Bwoink/BwoinkPanel.xaml.cs

@@ -2,6 +2,7 @@ using Content.Shared.Administration;
 using Robust.Client.AutoGenerated;
 using Robust.Client.UserInterface.Controls;
 using Robust.Client.UserInterface.XAML;
+using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 
 namespace Content.Client.Administration.UI.Bwoink
@@ -13,6 +14,8 @@ namespace Content.Client.Administration.UI.Bwoink
 
         public int Unread { get; private set; } = 0;
         public DateTime LastMessage { get; private set; } = DateTime.MinValue;
+        private List<string> PeopleTyping { get; set; } = new();
+        public event Action<string>? InputTextChanged;
 
         public BwoinkPanel(Action<string> messageSender)
         {
@@ -32,6 +35,8 @@ namespace Content.Client.Administration.UI.Bwoink
                     Unread = 0;
             };
             SenderLineEdit.OnTextEntered += Input_OnTextEntered;
+            SenderLineEdit.OnTextChanged += Input_OnTextChanged;
+            UpdateTypingIndicator();
         }
 
         private void Input_OnTextEntered(LineEdit.LineEditEventArgs args)
@@ -43,6 +48,11 @@ namespace Content.Client.Administration.UI.Bwoink
             SenderLineEdit.Clear();
         }
 
+        private void Input_OnTextChanged(LineEdit.LineEditEventArgs args)
+        {
+            InputTextChanged?.Invoke(args.Text);
+        }
+
         public void ReceiveLine(SharedBwoinkSystem.BwoinkTextMessage message)
         {
             if (!Visible)
@@ -53,5 +63,54 @@ namespace Content.Client.Administration.UI.Bwoink
             TextOutput.AddMessage(formatted);
             LastMessage = message.SentAt;
         }
+
+        private void UpdateTypingIndicator()
+        {
+            var msg = new FormattedMessage();
+            msg.PushColor(Color.LightGray);
+
+            var text = PeopleTyping.Count == 0
+                ? string.Empty
+                : Loc.GetString("bwoink-system-typing-indicator",
+                    ("players", string.Join(", ", PeopleTyping)),
+                    ("count", PeopleTyping.Count));
+
+            msg.AddText(text);
+            msg.Pop();
+
+            TypingIndicator.SetMessage(msg);
+        }
+
+        public void UpdatePlayerTyping(string name, bool typing)
+        {
+            if (typing)
+            {
+                if (PeopleTyping.Contains(name))
+                    return;
+
+                PeopleTyping.Add(name);
+                Timer.Spawn(TimeSpan.FromSeconds(10), () =>
+                {
+                    if (Disposed)
+                        return;
+
+                    PeopleTyping.Remove(name);
+                    UpdateTypingIndicator();
+                });
+            }
+            else
+            {
+                PeopleTyping.Remove(name);
+            }
+
+            UpdateTypingIndicator();
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            InputTextChanged = null;
+        }
     }
 }