Initial commit: Item Interaction Ecosystem plugin (UE5.7)

Server-authoritative, data-driven item/inventory/interaction/carry/equipment/
world-slot/placement/crafting framework. 8 modules, compiles against UE 5.7.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Source/ItemInventory/Private/ReplicatedInventoryList.cpp

@@ -0,0 +1,103 @@
+// Copyright ExByte Studios. Item Interaction Ecosystem.
+
+#include "ReplicatedInventoryList.h"
+#include "InventoryComponent.h"
+
+void FReplicatedInventoryList::PostReplicatedAdd(const TArrayView<int32>& AddedIndices, int32 /*FinalSize*/)
+{
+	if (!OwnerComponent)
+	{
+		return;
+	}
+	for (int32 Index : AddedIndices)
+	{
+		if (Entries.IsValidIndex(Index))
+		{
+			OwnerComponent->NotifyItemAdded(Entries[Index].Item);
+		}
+	}
+	OwnerComponent->NotifyInventoryChanged();
+}
+
+void FReplicatedInventoryList::PostReplicatedChange(const TArrayView<int32>& /*ChangedIndices*/, int32 /*FinalSize*/)
+{
+	if (OwnerComponent)
+	{
+		OwnerComponent->NotifyInventoryChanged();
+	}
+}
+
+void FReplicatedInventoryList::PreReplicatedRemove(const TArrayView<int32>& RemovedIndices, int32 /*FinalSize*/)
+{
+	if (!OwnerComponent)
+	{
+		return;
+	}
+	for (int32 Index : RemovedIndices)
+	{
+		if (Entries.IsValidIndex(Index))
+		{
+			OwnerComponent->NotifyItemRemoved(Entries[Index].Item);
+		}
+	}
+	OwnerComponent->NotifyInventoryChanged();
+}
+
+FRepInventoryEntry& FReplicatedInventoryList::AddOrUpdate(const FGuid& Container, int32 Slot, const FItemInstanceData& Item)
+{
+	if (FRepInventoryEntry* Existing = FindByInstanceId(Item.InstanceId))
+	{
+		Existing->ContainerId = Container;
+		Existing->SlotIndex = Slot;
+		Existing->Item = Item;
+		Existing->Item.CurrentContainerId = Container;
+		Existing->Item.SlotIndex = Slot;
+		MarkItemDirty(*Existing);
+		return *Existing;
+	}
+
+	FRepInventoryEntry& New = Entries.Emplace_GetRef(Container, Slot, Item);
+	New.Item.CurrentContainerId = Container;
+	New.Item.SlotIndex = Slot;
+	MarkItemDirty(New);
+	return New;
+}
+
+bool FReplicatedInventoryList::RemoveByInstanceId(const FGuid& InstanceId)
+{
+	const int32 Index = Entries.IndexOfByPredicate([&InstanceId](const FRepInventoryEntry& E)
+	{
+		return E.Item.InstanceId == InstanceId;
+	});
+	if (Index == INDEX_NONE)
+	{
+		return false;
+	}
+	Entries.RemoveAt(Index);
+	MarkArrayDirty();
+	return true;
+}
+
+void FReplicatedInventoryList::MarkEntryDirtyByInstanceId(const FGuid& InstanceId)
+{
+	if (FRepInventoryEntry* Entry = FindByInstanceId(InstanceId))
+	{
+		MarkItemDirty(*Entry);
+	}
+}
+
+FRepInventoryEntry* FReplicatedInventoryList::FindByInstanceId(const FGuid& InstanceId)
+{
+	return Entries.FindByPredicate([&InstanceId](const FRepInventoryEntry& E)
+	{
+		return E.Item.InstanceId == InstanceId;
+	});
+}
+
+const FRepInventoryEntry* FReplicatedInventoryList::FindByInstanceId(const FGuid& InstanceId) const
+{
+	return Entries.FindByPredicate([&InstanceId](const FRepInventoryEntry& E)
+	{
+		return E.Item.InstanceId == InstanceId;
+	});
+}