baseline: OpenMU upstream b5a0961 (fresh source)

src/GameLogic/PlugIns/PartyAutoRejoinPlugIn.cs

@@ -0,0 +1,33 @@
+// <copyright file="PartyAutoRejoinPlugIn.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic.PlugIns;
+
+using System.Runtime.InteropServices;
+using MUnique.OpenMU.GameLogic.Views.Party;
+using MUnique.OpenMU.PlugIns;
+
+/// <summary>
+/// Listens for the <see cref="IPlayerStateChangedPlugIn"/> and automatically rejoins the player
+/// to their previous party if it still exists when they enter the world.
+/// </summary>
+[PlugIn]
+[Display(
+    Name = nameof(PlugInResources.PartyAutoRejoinPlugIn_Name),
+    Description = nameof(PlugInResources.PartyAutoRejoinPlugIn_Description),
+    ResourceType = typeof(PlugInResources))]
+[Guid("013406B3-02AD-45EF-906B-177CBEC9B2D4")]
+public sealed class PartyAutoRejoinPlugIn : IPlayerStateChangedPlugIn
+{
+    /// <inheritdoc />
+    public async ValueTask PlayerStateChangedAsync(Player player, State previousState, State currentState)
+    {
+        if (currentState != PlayerState.EnteredWorld)
+        {
+            return;
+        }
+
+        await player.GameContext.PartyManager.OnMemberReconnectedAsync(player).ConfigureAwait(false);
+    }
+}