Try special handling for ModuleFuelTanks

Author: bfrobin446

B9PartSwitch/PartSwitch/ModuleModifierInfo.cs

@@ -135,6 +135,9 @@ public IEnumerable<IPartModifier> CreatePartModifiers(Part part, PartModule pare
                     yield return new ModuleOutputResourceResetter(module);
                     yield return new ModuleDataHandlerBasic(module, originalNode, dataNode);
                 }
+                else if (moduleName == "ModuleFuelTanks") {
+                    yield return new ModuleFuelTanksHandler(module, originalNode, dataNode);
+                }
                 else
                     yield return new ModuleDataHandlerBasic(module, originalNode, dataNode);
             }

B9PartSwitch/PartSwitch/PartModifiers/ModuleDataHandlerBasic.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Reflection;
 
 namespace B9PartSwitch.PartSwitch.PartModifiers
 {
@@ -31,7 +32,39 @@ public ModuleDataHandlerBasic(PartModule module, ConfigNode originalNode, Config
         public override void OnWasCopiedActiveSubtype() => Activate();
         public override void OnBeforeReinitializeActiveSubtype() => Deactivate();
 
-        private void Activate() => module.Load(dataNode);
-        private void Deactivate() => module.Load(originalNode);
+        protected virtual void Activate() => module.Load(dataNode);
+        protected virtual void Deactivate() => module.Load(originalNode);
+    }
+
+    public class ModuleFuelTanksHandler : ModuleDataHandlerBasic
+    {
+        public ModuleFuelTanksHandler(
+            PartModule module, ConfigNode originalNode, ConfigNode dataNode
+        ) : base(module, originalNode, dataNode)
+        { }
+
+        protected override void Activate() => applyNode(dataNode);
+        protected override void Deactivate() => applyNode(originalNode);
+
+        private void applyNode(ConfigNode sourceNode) {
+            double volume = 0;
+            bool setsVolume = sourceNode.TryGetValue("volume", ref volume);
+            string type = null;
+            bool setsType = sourceNode.TryGetValue("type", ref type);
+
+            if (setsVolume) {
+                Type ModuleFuelTanks = module.GetType();
+                FieldInfo volumeField = ModuleFuelTanks.GetField("volume");
+                double curVolume = (double)volumeField.GetValue(module);
+                if (volume != curVolume) {
+                    MethodInfo changeVolume = ModuleFuelTanks.GetMethod("ChangeVolume");
+                    changeVolume.Invoke(module, new object[]{ volume });
+                }
+            }
+            if (setsType) {
+                module.Fields.SetValue("type", type);
+            }
+        }
     }
 }
+