user enter, leave

Chat/Client/ChatRoomForm.cs

@@ -1,9 +1,11 @@
-using System;
+using Core;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
+using System.Net.Sockets;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
@@ -15,6 +17,14 @@ namespace Client
 		public ChatRoomForm()
 		{
 			InitializeComponent();
+			InitInstance();
+		}
+
+		private void InitInstance()
+		{
+			lbxUser.Items.Add(Singleton.Instance.Nickname);
+			Singleton.Instance.UserEnterResponsed += UserEnterResponsed;
+			Singleton.Instance.UserLeaveResponsed += UserLeaveResponsed;
 		}
 
 		private void btmSend_Click(object sender, EventArgs e)
@@ -33,5 +43,53 @@ namespace Client
 			lbxMsg.SelectedIndex = lbxMsg.Items.Count - 1;
 			lbxMsg.SelectedIndex = -1;
 		}
+
+		private void InvokeMethod(InvokedMethod method)
+		{
+			if (this.InvokeRequired)
+			{
+				this.Invoke(new MethodInvoker(() =>
+				{
+					method();
+				}));
+			}
+			else
+			{
+				method();
+			}
+		}
+
+		private void UserEnterResponsed(object? sender, EventArgs e)
+		{
+			if (sender == null)
+				return;
+
+			UserEnterPacket packet = (UserEnterPacket)sender;
+			InvokeMethod(() =>
+			{
+				lbxUser.Items.Add(packet.Nickname);
+			});
+		}
+
+		private void UserLeaveResponsed(object? sender, EventArgs e)
+		{
+			if (sender == null)
+				return;
+
+			UserLeavePacket packet = (UserLeavePacket)sender;
+			InvokeMethod(() =>
+			{
+				lbxUser.Items.Remove(packet.Nickname);
+			});
+		}
+
+		private async void ChatRoomForm_FormClosing(object sender, FormClosingEventArgs e)
+		{
+			Singleton.Instance.UserEnterResponsed -= UserEnterResponsed;
+			Singleton.Instance.UserLeaveResponsed -= UserLeaveResponsed;
+			
+			UserLeavePacket packet = new UserLeavePacket(Singleton.Instance.Nickname);
+			await Singleton.Instance.SendAsync(packet.Serialize(), SocketFlags.None);
+		}
 	}
 }