UInventoryObjectBase

The base class for all inventory item objects. Provides shared data, editor validation, and default implementations for the IInventoryItemInterface.

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Overview

UInventoryObjectBase serves as the foundation for all items used within the Inventory Plugin. It defines the core metadata (name, description, icon, stack size) and provides default implementations for the IInventoryItemInterface.

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Class Declaration

UCLASS(Abstract, Blueprintable, BlueprintType, EditInlineNew, meta=(ShowWorldContextPin))
class INVENTORYPLUGIN_API UInventoryObjectBase 
    : public UObject, 
      public IInventoryItemInterface
{
    GENERATED_BODY()

public:
    virtual int32 GetMaxStackSize_Implementation() const override;
    virtual FText GetItemName_Implementation() const override;
    virtual FText GetItemDescription_Implementation() const override;
    virtual UTexture2D* GetItemIcon_Implementation() const override;

    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Inventory Item")
    FText ItemDescription;

    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Inventory Item")
    FText ItemName;

    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Inventory Item")
    int32 MaxStack;

    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Inventory Item")
    UTexture2D* ItemIcon;

#if WITH_EDITOR
    virtual EDataValidationResult IsDataValid(FDataValidationContext& Context) const override;
#endif
};

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Details

Inheritance

• Parent Class: UObject
• Implements: IInventoryItemInterface

Specifiers

Specifier	Description
Abstract	Cannot be instantiated directly. Must be subclassed.
Blueprintable	Can be extended via Blueprints.
BlueprintType	Usable as a variable type in Blueprints.
EditInlineNew	Allows editing instances directly in the editor (ideal for instanced items).
ShowWorldContextPin	Enables world context pin when used in Blueprint functions.

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Properties

Property	Type	Description
ItemName	FText	The display name of the item. Shown in UI and tooltips.
ItemDescription	FText	Descriptive text about the item.
MaxStack	int32	Maximum quantity of the item that can be stacked in a single inventory slot.
ItemIcon	UTexture2D*	The icon used to visually represent the item in UI.

Example:

UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Inventory Item")
int32 MaxStack = 1;

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Functions

GetItemName()

Returns the display name of the item.

virtual FText GetItemName_Implementation() const override;

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GetItemDescription()

Returns the item’s description text.

virtual FText GetItemDescription_Implementation() const override;

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GetItemIcon()

Returns the UI icon representing the item.

virtual UTexture2D* GetItemIcon_Implementation() const override;

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GetMaxStackSize()

Returns the maximum number of items that can stack in a single slot.

virtual int32 GetMaxStackSize_Implementation() const override;

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IsDataValid()

Editor-only. Performs validation checks when editing the item in the Unreal Editor.

virtual EDataValidationResult IsDataValid(FDataValidationContext& Context) const override;

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Example Blueprint Setup

1. Create a new Blueprint Class derived from UInventoryObjectBase.
2. Fill in the Item Name, Description, and Icon.
3. Set MaxStack to the appropriate value (e.g., 1 for unique items, 99 for stackables).

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Example Instance

To instance an Inventory Object, simply open the context menu like any other asset.

Select a class that you would like to use for the Inventory Object.

Then add in data.

Integration

UInventoryObjectBase interacts seamlessly with:

• UItemComponent: wraps this object on an actor.
• UInventoryComponentBase: manages stacking, transfer, and replication.
• IInventoryItemInterface: defines item behavior when used, dropped, or transferred.

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Example Usage

C++ Example

UCLASS()
class UHealingPotionItem : public UInventoryObjectBase
{
    GENERATED_BODY()

public:
    virtual void OnUse_Implementation(UInventoryComponentBase* InventoryComponent) override
    {
        AActor* Owner = InventoryComponent->GetOwner();
        UE_LOG(LogTemp, Log, TEXT("%s used a Healing Potion!"), *Owner->GetName());
        // Apply healing or other gameplay effect here
    }
};

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Relationship Diagram

UInventoryObjectBase
        ▲
        │
        │ implements
        │
IInventoryItemInterface
        │
        │ used by
        ▼
UInventoryComponentBase ──► Manages items

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Summary

• UInventoryObjectBase defines item data and default interface behavior.
• It’s fully Blueprint-compatible and can be used as either authored or instanced.
• Works directly with the inventory and item components.
• Provides built-in editor validation and UI-friendly fields.

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Would you like me to follow this up with a matching Docusaurus doc for IInventoryItemInterface, including all Blueprint events (CanBeUsed, OnUse, etc.), their intended behaviors, and example override usage? It would complete the documentation set neatly.