Multiplayer support with MPAPI 0.1

Source/Multiplayer.cs

@@ -0,0 +1,57 @@
+using System.Collections.Generic;
+using System.Linq;
+using Multiplayer.API;
+using Verse;
+
+namespace ResearchPal
+{
+    // Can be run anywhere really. Multiplayer runs its API init code on Mod()
+    // and since it runs always after Core, it's certain it will be ready.
+    [StaticConstructorOnStartup]
+    public static class Multiplayer
+    {
+        static Dictionary<ResearchProjectDef, ResearchNode> _cache;
+
+        static Multiplayer()
+        {
+            if (!MP.enabled) return;
+
+            // Let's sync all Queue operations that involve the GUI
+            // Don't worry about EnqueueRange calling Enqueue, MP mod handles it
+            MP.RegisterSyncMethod(typeof(Queue), nameof(Queue.Enqueue));
+            MP.RegisterSyncMethod(typeof(Queue), nameof(Queue.EnqueueRange));
+            MP.RegisterSyncMethod(typeof(Queue), nameof(Queue.Dequeue));
+
+            MP.RegisterSyncWorker<ResearchNode>(HandleResearchNode);
+
+            Log.Message("Initialized compatibility for Multiplayer");
+        }
+
+        static ResearchNode Lookup(ResearchProjectDef projectDef)
+        {
+            if (_cache == null)
+                _cache = Tree.Nodes.OfType<ResearchNode>().ToDictionary(r => r.Research);
+
+            return _cache[projectDef];
+        }
+
+        // We only care about the research, no new nodes will be created or moved.
+        static void HandleResearchNode(SyncWorker sw, ref ResearchNode node)
+        {
+            // Bind commands are in the order they are placed
+            // So if you write a Def first, you must read it first and so on
+            if (sw.isWriting) {
+                // We are writing, node is the outgoing object
+                sw.Bind(ref node.Research);
+            } else {
+                ResearchProjectDef research = null;
+
+                sw.Bind(ref research);
+
+                // We are reading, node is null, we must set it. So we look it up
+                // research is unique in the Tree
+                node = Lookup(research);
+            }
+        }
+    }
+}

Source/ResearchTree.csproj

@@ -53,6 +53,9 @@
       <HintPath>..\Dlls\UnityEngine.dll</HintPath>
       <Private>False</Private>
     </Reference>
+    <Reference Include="0MultiplayerAPI">
+      <HintPath>..\Dlls\0MultiplayerAPI.dll</HintPath>
+    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Assets.cs" />
@@ -76,6 +79,7 @@
     <Compile Include="ResearchTree.cs" />
     <Compile Include="Settings.cs" />
     <Compile Include="ResourceBank.cs" />
+    <Compile Include="Multiplayer.cs" />
   </ItemGroup>
   <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />