Extract StoresResources from Harvester

OpenRA.Mods.Common/Traits/StoresPlayerResources.cs

@@ -0,0 +1,67 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Adds capacity to a player's harvested resource limit.")]
+	public class StoresPlayerResourcesInfo : TraitInfo
+	{
+		[FieldLoader.Require]
+		public readonly int Capacity = 0;
+
+		public override object Create(ActorInitializer init) { return new StoresPlayerResources(init.Self, this); }
+	}
+
+	public class StoresPlayerResources : INotifyOwnerChanged, INotifyCapture, INotifyKilled, INotifyAddedToWorld, INotifyRemovedFromWorld
+	{
+		readonly StoresPlayerResourcesInfo info;
+		PlayerResources player;
+
+		public int Stored => player.ResourceCapacity == 0 ? 0 : (int)((long)info.Capacity * player.Resources / player.ResourceCapacity);
+
+		public StoresPlayerResources(Actor self, StoresPlayerResourcesInfo info)
+		{
+			this.info = info;
+			player = self.Owner.PlayerActor.Trait<PlayerResources>();
+		}
+
+		void INotifyOwnerChanged.OnOwnerChanged(Actor self, Player oldOwner, Player newOwner)
+		{
+			player = newOwner.PlayerActor.Trait<PlayerResources>();
+		}
+
+		void INotifyCapture.OnCapture(Actor self, Actor captor, Player oldOwner, Player newOwner, BitSet<CaptureType> captureTypes)
+		{
+			var resources = Stored;
+			oldOwner.PlayerActor.Trait<PlayerResources>().TakeResources(resources);
+			newOwner.PlayerActor.Trait<PlayerResources>().GiveResources(resources);
+		}
+
+		void INotifyKilled.Killed(Actor self, AttackInfo e)
+		{
+			// Lose the stored resources.
+			player.TakeResources(Stored);
+		}
+
+		void INotifyAddedToWorld.AddedToWorld(Actor self)
+		{
+			player.AddStorageCapacity(info.Capacity);
+		}
+
+		void INotifyRemovedFromWorld.RemovedFromWorld(Actor self)
+		{
+			player.RemoveStorageCapacity(info.Capacity);
+		}
+	}
+}