C++ UClass::HasMetaData方法代码示例

bool FComponentEditorUtils::CanCopyComponents(const TArray<UActorComponent*>& ComponentsToCopy)
{
	bool bCanCopy = ComponentsToCopy.Num() > 0;
	if (bCanCopy)
	{
		for (int32 i = 0; i < ComponentsToCopy.Num() && bCanCopy; ++i)
		{
			// Check for the default scene root; that cannot be copied/duplicated
			UActorComponent* Component = ComponentsToCopy[i];
			bCanCopy = Component != nullptr && Component->GetFName() != USceneComponent::GetDefaultSceneRootVariableName();
			if (bCanCopy)
			{
				UClass* ComponentClass = Component->GetClass();
				check(ComponentClass != nullptr);

				// Component class cannot be abstract and must also be tagged as BlueprintSpawnable
				bCanCopy = !ComponentClass->HasAnyClassFlags(CLASS_Abstract)
					&& ComponentClass->HasMetaData(FBlueprintMetadata::MD_BlueprintSpawnableComponent);
			}
		}
	}

	return bCanCopy;
}

void FEmitDefaultValueHelper::GenerateConstructor(FEmitterLocalContext& Context)
{
	GenerateCustomDynamicClassInitialization(Context);

	auto BPGC = CastChecked<UBlueprintGeneratedClass>(Context.GetCurrentlyGeneratedClass());
	const FString CppClassName = FEmitHelper::GetCppName(BPGC);

	UClass* SuperClass = BPGC->GetSuperClass();
	const bool bSuperHasOnlyDefaultConstructor = SuperClass && SuperClass->HasMetaData(TEXT("OnlyDefaultConstructorDeclared"));

	Context.CurrentCodeType = FEmitterLocalContext::EGeneratedCodeType::CommonConstructor;
	Context.ResetPropertiesForInaccessibleStructs();
	Context.AddLine(FString::Printf(TEXT("%s::%s(const FObjectInitializer& ObjectInitializer) : Super(%s)")
		, *CppClassName
		, *CppClassName
		, bSuperHasOnlyDefaultConstructor ? TEXT("") : TEXT("ObjectInitializer")));
	Context.AddLine(TEXT("{"));
	Context.IncreaseIndent();

	// Call CustomDynamicClassInitialization
	Context.AddLine(FString::Printf(TEXT("if(HasAnyFlags(RF_ClassDefaultObject) && (%s::StaticClass() == GetClass()))"), *CppClassName));
	Context.AddLine(TEXT("{"));
	Context.IncreaseIndent();
	Context.AddLine(FString::Printf(TEXT("%s::__CustomDynamicClassInitialization(CastChecked<UDynamicClass>(GetClass()));"), *CppClassName));
	Context.DecreaseIndent();
	Context.AddLine(TEXT("}"));

	// Components that must be fixed after serialization
	TArray<FString> NativeCreatedComponentProperties;

	{
		UObject* CDO = BPGC->GetDefaultObject(false);

		UObject* ParentCDO = BPGC->GetSuperClass()->GetDefaultObject(false);
		check(CDO && ParentCDO);
		Context.AddLine(TEXT(""));

		FString NativeRootComponentFallback;
		TSet<const UProperty*> HandledProperties;

		// Generate ctor init code for native class default subobjects that are always instanced (e.g. components).
		// @TODO (pkavan) - We can probably make this faster by generating code to index through the DSO array instead (i.e. in place of HandleInstancedSubobject which will generate a lookup call per DSO).
		TArray<UObject*> NativeDefaultObjectSubobjects;
		BPGC->GetDefaultObjectSubobjects(NativeDefaultObjectSubobjects);
		for (auto DSO : NativeDefaultObjectSubobjects)
		{
			if (DSO && DSO->GetClass()->HasAnyClassFlags(CLASS_DefaultToInstanced))
			{
				// Determine if this is an editor-only subobject.
				bool bIsEditorOnlySubobject = false;
				if (const UActorComponent* ActorComponent = Cast<UActorComponent>(DSO))
				{
					bIsEditorOnlySubobject = ActorComponent->IsEditorOnly();
				}

				// Skip ctor code gen for editor-only subobjects, since they won't be used by the runtime. Any dependencies on editor-only subobjects will be handled later (see HandleInstancedSubobject).
				if (!bIsEditorOnlySubobject)
				{
					const FString VariableName = HandleInstancedSubobject(Context, DSO, false, true);

					// Keep track of which component can be used as a root, in case it's not explicitly set.
					if (NativeRootComponentFallback.IsEmpty())
					{
						USceneComponent* SceneComponent = Cast<USceneComponent>(DSO);
						if (SceneComponent && !SceneComponent->GetAttachParent() && SceneComponent->CreationMethod == EComponentCreationMethod::Native)
						{
							NativeRootComponentFallback = VariableName;
						}
					}
				}
			}
		}

		// Check for a valid RootComponent property value; mark it as handled if already set in the defaults.
		bool bNeedsRootComponentAssignment = false;
		static const FName RootComponentPropertyName(TEXT("RootComponent"));
		const UObjectProperty* RootComponentProperty = FindField<UObjectProperty>(BPGC, RootComponentPropertyName);
		if (RootComponentProperty)
		{
			if (RootComponentProperty->GetObjectPropertyValue_InContainer(CDO))
			{
				HandledProperties.Add(RootComponentProperty);
			}
			else if (!NativeRootComponentFallback.IsEmpty())
			{
				Context.AddLine(FString::Printf(TEXT("RootComponent = %s;"), *NativeRootComponentFallback));
				HandledProperties.Add(RootComponentProperty);
			}
			else
			{
				bNeedsRootComponentAssignment = true;
			}
		}

		// Generate ctor init code for the SCS node hierarchy (i.e. non-native components). SCS nodes may have dependencies on native DSOs, but not vice-versa.
		TArray<const UBlueprintGeneratedClass*> BPGCStack;
		const bool bErrorFree = UBlueprintGeneratedClass::GetGeneratedClassesHierarchy(BPGC, BPGCStack);
		if (bErrorFree)
		{
			TArray<FNonativeComponentData> ComponentsToInit;
//.........这里部分代码省略.........

void UK2Node_AddComponent::ValidateNodeDuringCompilation(FCompilerResultsLog& MessageLog) const
{
	Super::ValidateNodeDuringCompilation(MessageLog);

	UActorComponent* Template = GetTemplateFromNode();
	if (Template)
	{
		UClass* TemplateClass = Template->GetClass();
		if (!TemplateClass->IsChildOf(UActorComponent::StaticClass()) || TemplateClass->HasAnyClassFlags(CLASS_Abstract) || !TemplateClass->HasMetaData(FBlueprintMetadata::MD_BlueprintSpawnableComponent) )
		{
			FFormatNamedArguments Args;
			Args.Add(TEXT("TemplateClass"), FText::FromString(TemplateClass->GetName()));
			Args.Add(TEXT("NodeTitle"), GetNodeTitle(ENodeTitleType::FullTitle));
			MessageLog.Error(*FText::Format(NSLOCTEXT("KismetCompiler", "InvalidComponentTemplate_Error", "Invalid class '{TemplateClass}' used as template by '{NodeTitle}' for @@"), Args).ToString(), this);
		}

		if (UChildActorComponent const* ChildActorComponent = Cast<UChildActorComponent const>(Template))
		{
			UBlueprint const* Blueprint = GetBlueprint();

			UClass const* ChildActorClass = ChildActorComponent->GetChildActorClass();
			if (ChildActorClass == Blueprint->GeneratedClass)
			{
				UEdGraph const* ParentGraph = GetGraph();
				UEdGraphSchema_K2 const* K2Schema = GetDefault<UEdGraphSchema_K2>();

				if (K2Schema->IsConstructionScript(ParentGraph))
				{
					FFormatNamedArguments Args;
					Args.Add(TEXT("ChildActorClass"), FText::FromString(ChildActorClass->GetName()));
					MessageLog.Error(*FText::Format(NSLOCTEXT("KismetCompiler", "AddSelfComponent_Error", "@@ cannot add a '{ChildActorClass}' component in the construction script (could cause infinite recursion)."), Args).ToString(), this);
				}
			}
			else if (ChildActorClass != nullptr)
			{
				AActor const* ChildActor = Cast<AActor>(ChildActorClass->ClassDefaultObject);
				check(ChildActor != nullptr);
				USceneComponent* RootComponent = ChildActor->GetRootComponent();

				if ((RootComponent != nullptr) && (RootComponent->Mobility == EComponentMobility::Static) && (ChildActorComponent->Mobility != EComponentMobility::Static))
				{
					FFormatNamedArguments Args;
					Args.Add(TEXT("ChildActorClass"), FText::FromString(ChildActorClass->GetName()));
					MessageLog.Error(*FText::Format(NSLOCTEXT("KismetCompiler", "AddStaticChildActorComponent_Error", "@@ cannot add a '{ChildActorClass}' component as it has static mobility, and the ChildActorComponent does not."), Args).ToString(), this);
				}
			}
		}
	}
	else
	{
		FFormatNamedArguments Args;
		Args.Add(TEXT("NodeTitle"), GetNodeTitle(ENodeTitleType::FullTitle));
		MessageLog.Error(*FText::Format(NSLOCTEXT("KismetCompiler", "MissingComponentTemplate_Error", "Unknown template referenced by '{NodeTitle}' for @@"), Args).ToString(), this);
	}
}

		ComponentClassList.Add(NewSeparator);
	}

	TArray<FComponentClassComboEntryPtr> SortedClassList;

	AddBasicShapeComponents(SortedClassList);

	TArray<FName> InMemoryClasses;
	for (TObjectIterator<UClass> It; It; ++It)
	{
		UClass* Class = *It;
		// If this is a subclass of Actor Component, not abstract, and tagged as spawnable from Kismet
		if (Class->IsChildOf(UActorComponent::StaticClass()))
		{
			InMemoryClasses.Push(Class->GetFName());
			if (!Class->HasAnyClassFlags(CLASS_Abstract) && Class->HasMetaData(FBlueprintMetadata::MD_BlueprintSpawnableComponent) && !FKismetEditorUtilities::IsClassABlueprintSkeleton(Class)) //@TODO: Fold this logic together with the one in UEdGraphSchema_K2::GetAddComponentClasses
			{
				TArray<FString> ClassGroupNames;
				Class->GetClassGroupNames(ClassGroupNames);

				if (ClassGroupNames.Contains(CommonClassGroup))
				{
					FString ClassGroup = CommonClassGroup;
					FComponentClassComboEntryPtr NewEntry(new FComponentClassComboEntry(ClassGroup, Class, ClassGroupNames.Num() <= 1, EComponentCreateAction::SpawnExistingClass));
					SortedClassList.Add(NewEntry);
				}
				if (ClassGroupNames.Num() && !ClassGroupNames[0].Equals(CommonClassGroup))
				{
					const bool bIncludeInFilter = true;

					FString ClassGroup = ClassGroupNames[0];