BuildingISMComponent.h

#pragma once

#include "CoreMinimal.h"
#include "Components/InstancedStaticMeshComponent.h"
#include "BuildingISMComponent.generated.h"


UCLASS(ClassGroup = (Rendering, Common), hidecategories = (Object, Activation, "Components|Activation"),
    ShowCategories = (Mobility), editinlinenew, meta = (BlueprintSpawnableComponent))
    class LOFILIFESIM_API UBuildingISMComponent : public UInstancedStaticMeshComponent
{
    GENERATED_BODY()

public:

    DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnInstanceAdded, int32, InstanceIndex, FTransform, InstanceTransform);

    DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnInstanceRemoved, int32, InstanceIndex, FTransform, LastTransform);

    DECLARE_DYNAMIC_MULTICAST_DELEGATE_FourParams(FOnInstanceMoved, int32, OldIndex, FTransform, OldTransform, int32, NewIndex, FTransform, NewTransform);

    UBuildingISMComponent(const FObjectInitializer& ObjectInitializer = FObjectInitializer::Get());

    UPROPERTY(BlueprintAssignable, Category = "Instance Events")
    FOnInstanceAdded OnInstanceAdded;

    UPROPERTY(BlueprintAssignable, Category = "Instance Events")
    FOnInstanceRemoved OnInstanceRemoved;

    UPROPERTY(BlueprintAssignable, Category = "Instance Events")
    FOnInstanceMoved OnInstanceMoved;

protected:
    virtual void BeginPlay() override;
    virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;

public:
    void HandleInstanceIndexUpdated(UInstancedStaticMeshComponent* InComponent, TArrayView<const FInstancedStaticMeshDelegates::FInstanceIndexUpdateData> InIndexUpdates);

    bool IsValidInstanceIndex(int32 Index) const;

protected:
    // Internal delegate binding
    void BindToInternalDelegates();
    void UnbindFromInternalDelegates();

private:
    // Track if we've bound to internal delegates
    bool bDelegatesBound;

    // Cache transforms to provide data for removal events
    UPROPERTY()
    TMap<int32, FTransform> CachedInstanceTransforms;
};