SObjectPropertyEntryBoxでActorアセットを選択する話のやつ

UBlueprintSelectBox.cpp

// crssnky


#include "BlueprintSelectBox.h"
#include "PropertyCustomizationHelpers.h"

UBlueprintSelectBox::UBlueprintSelectBox(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{}

void UBlueprintSelectBox::GenerateWidget(UClass* targetClass)
{
	// reset
	if (m_entryBox.IsValid())
	{
		m_entryBox.Reset();
	}
	m_selected = nullptr;

	// class
	const auto targetClas_BP = UBlueprint::GetBlueprintFromClass(targetClass);

	// widget
	SAssignNew(m_entryBox, SObjectPropertyEntryBox)
		.AllowedClass(targetClas_BP ? UBlueprint::StaticClass() : targetClass)
		.OnShouldFilterAsset_Lambda([targetClas_BP](const FAssetData& assetData)
			{
				if (targetClas_BP)
				{
					const auto asset = Cast<UBlueprint>(assetData.GetAsset());
					if (asset)
					{
						return !(asset->ParentClass->IsChildOf(targetClas_BP->ParentClass));
					}
					else
					{
						return true;
					}
				}
				else
				{
					return false;
				}
			})
		.ObjectPath_Lambda([this]()->FString const
			{
				return m_selected ? m_selected->GetPathName() : TEXT("");
			})
				.OnObjectChanged_Lambda([this](const FAssetData& assetData)
					{
						m_selected = Cast<UObject>(assetData.GetAsset());
						BlueprintSelectedDelegate.Broadcast(m_selected);
					});


			SetContent(m_entryBox.ToSharedRef());
}

FAssetData UBlueprintSelectBox::GetAssetData() const
{
	return m_selected;
}

UBlueprintSelectBox.h

// crssnky

#pragma once

#include "CoreMinimal.h"
#include "Components/NativeWidgetHost.h"
#include "BlueprintSelectBox.generated.h"

DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FBlueprintSelected, const UObject*, selected);

class SObjectPropertyEntryBox;

/**
 *
 */
UCLASS()
class SKYATMOSPHERE_API UBlueprintSelectBox : public UNativeWidgetHost
{
	GENERATED_BODY()
public:
	UBlueprintSelectBox(const FObjectInitializer& ObjectInitializer);

	UFUNCTION(BlueprintCallable, Category = "MyPrj|UMG")
		void GenerateWidget(UClass* targetClass);
	UFUNCTION(BlueprintCallable, Category = "MyPrj|UMG")
		FAssetData GetAssetData()const;
	UPROPERTY(BlueprintReadWrite, Category = "MyPrj|UMG")
		FBlueprintSelected BlueprintSelectedDelegate;

private:
	TSharedPtr<SObjectPropertyEntryBox> m_entryBox = nullptr;
	UObject* m_selected = nullptr;
};

この スニペット は クリエイティブ・コモンズ 表示 4.0 国際 ライセンスの下に提供されているとする