C++ UActorComponent::OnComponentCreated方法代码示例

UActorComponent* UActorBlueprintLibrary::AttachComponentOfClass(UObject* WorldContextObject, TSubclassOf<UActorComponent> ComponentClass, AActor* Owner, FName ComponentName, USceneComponent* AttachTo, FName SocketName)
{
	if (!Owner)
	{
		return nullptr;
	}

	UActorComponent* Component = NewObject<UActorComponent>(Owner, *ComponentClass, ComponentName);
	if (!Component)
	{
		return nullptr;
	}

	Component->RegisterComponent();
	Component->OnComponentCreated();

	USceneComponent* SceneComponent = Cast<USceneComponent>(Component);
	if (SceneComponent)
	{
		SceneComponent->SetWorldLocation(Owner->GetActorLocation());
		SceneComponent->SetWorldRotation(Owner->GetActorRotation());

		USceneComponent* AttachToComponent = AttachTo ? AttachTo : Owner->GetRootComponent();

		SceneComponent->AttachToComponent(AttachToComponent, FAttachmentTransformRules::KeepWorldTransform, SocketName);
	}

	return Component;
}

UActorComponent* AActor::AddComponent(FName TemplateName, bool bManualAttachment, const FTransform& RelativeTransform, const UObject* ComponentTemplateContext)
{
	UActorComponent* Template = nullptr;
	UBlueprintGeneratedClass* BlueprintGeneratedClass = Cast<UBlueprintGeneratedClass>((ComponentTemplateContext != nullptr) ? ComponentTemplateContext->GetClass() : GetClass());
	while(BlueprintGeneratedClass != nullptr)
	{
		Template = BlueprintGeneratedClass->FindComponentTemplateByName(TemplateName);
		if(nullptr != Template)
		{
			break;
		}
		BlueprintGeneratedClass = Cast<UBlueprintGeneratedClass>(BlueprintGeneratedClass->GetSuperClass());
	}

	bool bIsSceneComponent = false;
	UActorComponent* NewActorComp = CreateComponentFromTemplate(Template);
	if(NewActorComp != nullptr)
	{
		// Call function to notify component it has been created
		NewActorComp->OnComponentCreated();
		
		// The user has the option of doing attachment manually where they have complete control or via the automatic rule
		// that the first component added becomes the root component, with subsequent components attached to the root.
		USceneComponent* NewSceneComp = Cast<USceneComponent>(NewActorComp);
		if(NewSceneComp != nullptr)
		{
			if (!bManualAttachment)
			{
				if (RootComponent == nullptr)
				{
					RootComponent = NewSceneComp;
				}
				else
				{
					NewSceneComp->AttachTo(RootComponent);
				}
			}

			NewSceneComp->SetRelativeTransform(RelativeTransform);

			bIsSceneComponent = true;
		}

		// Register component, which will create physics/rendering state, now component is in correct position
		NewActorComp->RegisterComponent();

		UWorld* World = GetWorld();
		if (!bRunningUserConstructionScript && World && bIsSceneComponent)
		{
			UPrimitiveComponent* NewPrimitiveComponent = Cast<UPrimitiveComponent>(NewActorComp);
			if (NewPrimitiveComponent && ACullDistanceVolume::CanBeAffectedByVolumes(NewPrimitiveComponent))
			{
				World->UpdateCullDistanceVolumes(this, NewPrimitiveComponent);
			}
		}
	}

	return NewActorComp;
}

UActorComponent* FComponentEditorUtils::DuplicateComponent(UActorComponent* TemplateComponent)
{
	check(TemplateComponent);

	UActorComponent* NewCloneComponent = nullptr;
	AActor* Actor = TemplateComponent->GetOwner();
	if (!TemplateComponent->IsEditorOnly() && Actor)
	{
		Actor->Modify();
		UClass* ComponentClass = TemplateComponent->GetClass();
		FName NewComponentName = *FComponentEditorUtils::GenerateValidVariableName(ComponentClass, Actor);

		bool bKeepWorldLocationOnAttach = false;

		const bool bTemplateTransactional = TemplateComponent->HasAllFlags(RF_Transactional);
		TemplateComponent->SetFlags(RF_Transactional);

		NewCloneComponent = DuplicateObject<UActorComponent>(TemplateComponent, Actor, NewComponentName );
		
		if (!bTemplateTransactional)
		{
			TemplateComponent->ClearFlags(RF_Transactional);
		}
			
		USceneComponent* NewSceneComponent = Cast<USceneComponent>(NewCloneComponent);
		if (NewSceneComponent)
		{
			// Ensure the clone doesn't think it has children
			NewSceneComponent->AttachChildren.Empty();

			// If the clone is a scene component without an attach parent, attach it to the root (can happen when duplicating the root component)
			if (!NewSceneComponent->GetAttachParent())
			{
				USceneComponent* RootComponent = Actor->GetRootComponent();
				check(RootComponent);

				// ComponentToWorld is not a UPROPERTY, so make sure the clone has calculated it properly before attachment
				NewSceneComponent->UpdateComponentToWorld();

				NewSceneComponent->AttachTo(RootComponent, NAME_None, EAttachLocation::KeepWorldPosition);
			}
		}

		NewCloneComponent->OnComponentCreated();

		// Add to SerializedComponents array so it gets saved
		Actor->AddInstanceComponent(NewCloneComponent);
		
		// Register the new component
		NewCloneComponent->RegisterComponent();

		// Rerun construction scripts
		Actor->RerunConstructionScripts();
	}

	return NewCloneComponent;
}

UActorComponent* USCS_Node::ExecuteNodeOnActor(AActor* Actor, USceneComponent* ParentComponent, const FTransform* RootTransform, bool bIsDefaultTransform)
{
	check(Actor != nullptr);
	check((ParentComponent != nullptr && !ParentComponent->IsPendingKill()) || (RootTransform != nullptr)); // must specify either a parent component or a world transform

	auto ActualBPGC = Cast<UBlueprintGeneratedClass>(Actor->GetClass());
	UActorComponent* ActualComponentTemplate = GetActualComponentTemplate(ActualBPGC);

	// Create a new component instance based on the template
	UActorComponent* NewActorComp = Actor->CreateComponentFromTemplate(ActualComponentTemplate, VariableName.ToString());
	if(NewActorComp != nullptr)
	{
		NewActorComp->CreationMethod = EComponentCreationMethod::SimpleConstructionScript;
		// SCS created components are net addressable
		NewActorComp->SetNetAddressable();

		// Special handling for scene components
		USceneComponent* NewSceneComp = Cast<USceneComponent>(NewActorComp);
		if (NewSceneComp != nullptr)
		{
			// If NULL is passed in, we are the root, so set transform and assign as RootComponent on Actor
			if (ParentComponent == nullptr || (ParentComponent && ParentComponent->IsPendingKill()))
			{
				FTransform WorldTransform = *RootTransform;
				if(bIsDefaultTransform)
				{
					// Note: We use the scale vector from the component template when spawning (to match what happens with a native root)
					WorldTransform.SetScale3D(NewSceneComp->RelativeScale3D);
				}
				NewSceneComp->SetWorldTransform(WorldTransform);
				Actor->SetRootComponent(NewSceneComp);
			}
			// Otherwise, attach to parent component passed in
			else
			{
				NewSceneComp->AttachTo(ParentComponent, AttachToName);
			}
		}

		// Call function to notify component it has been created
		NewActorComp->OnComponentCreated();

		if (NewActorComp->GetIsReplicated())
		{
			// Make sure this component is added to owning actor's replicated list.
			NewActorComp->SetIsReplicated(true);
		}

		// If we want to save this to a property, do it here
		FName VarName = GetVariableName();
		if (VarName != NAME_None)
		{
			UClass* ActorClass = Actor->GetClass();
			if (UObjectPropertyBase* Prop = FindField<UObjectPropertyBase>(ActorClass, VarName))
			{
				Prop->SetObjectPropertyValue_InContainer(Actor, NewActorComp);
			}
			else
			{
				UE_LOG(LogBlueprint, Log, TEXT("ExecuteNodeOnActor: Couldn't find property '%s' on '%s"), *VarName.ToString(), *Actor->GetName());
#if WITH_EDITOR
				// If we're constructing editable components in the SCS editor, set the component instance corresponding to this node for editing purposes
				USimpleConstructionScript* SCS = GetSCS();
				if(SCS != nullptr && (SCS->IsConstructingEditorComponents() || SCS->GetComponentEditorActorInstance() == Actor))
				{
					EditorComponentInstance = NewSceneComp;
				}
#endif
			}
		}

		// Determine the parent component for our children (it's still our parent if we're a non-scene component)
		USceneComponent* ParentSceneComponentOfChildren = (NewSceneComp != nullptr) ? NewSceneComp : ParentComponent;

		// If we made a component, go ahead and process our children
		for (int32 NodeIdx = 0; NodeIdx < ChildNodes.Num(); NodeIdx++)
		{
			USCS_Node* Node = ChildNodes[NodeIdx];
			check(Node != nullptr);
			Node->ExecuteNodeOnActor(Actor, ParentSceneComponentOfChildren, nullptr, false);
		}
	}

	return NewActorComp;
}

UActorComponent* AActor::AddComponent(FName TemplateName, bool bManualAttachment, const FTransform& RelativeTransform, const UObject* ComponentTemplateContext)
{
	UActorComponent* Template = NULL;
	UBlueprintGeneratedClass* BlueprintGeneratedClass = Cast<UBlueprintGeneratedClass>((ComponentTemplateContext != NULL) ? ComponentTemplateContext->GetClass() : GetClass());
	while(BlueprintGeneratedClass != NULL)
	{
		Template = BlueprintGeneratedClass->FindComponentTemplateByName(TemplateName);
		if(NULL != Template)
		{
			break;
		}
		BlueprintGeneratedClass = Cast<UBlueprintGeneratedClass>(BlueprintGeneratedClass->GetSuperClass());
	}

	UActorComponent* NewActorComp = CreateComponentFromTemplate(Template);
	if(NewActorComp != NULL)
	{
		// The user has the option of doing attachment manually where they have complete control or via the automatic rule
		// that the first component added becomes the root component, with subsequent components attached to the root.
		USceneComponent* NewSceneComp = Cast<USceneComponent>(NewActorComp);
		bool bDeferRegisterStaticComponent = false;
		EComponentMobility::Type OriginalMobility = EComponentMobility::Movable;

		if(NewSceneComp != NULL)
		{
			// Components with Mobility set to EComponentMobility::Static or EComponentMobility::Stationary can't be properly set up in UCS (all changes will be rejected
			// due to EComponentMobility::Static flag) so we're going to temporarily change the flag and defer the registration until UCS has finished.
			bDeferRegisterStaticComponent = bRunningUserConstructionScript && NewSceneComp->Mobility != EComponentMobility::Movable;
			OriginalMobility = NewSceneComp->Mobility;
			if (bDeferRegisterStaticComponent)
			{
				NewSceneComp->Mobility = EComponentMobility::Movable;
			}

			if (!bManualAttachment)
			{
				if (RootComponent == NULL)
				{
					RootComponent = NewSceneComp;
				}
				else
				{
					NewSceneComp->AttachTo(RootComponent);
				}
			}

			NewSceneComp->SetRelativeTransform(RelativeTransform);
		}

		// Call function to notify component it has been created
		NewActorComp->OnComponentCreated();

		if (bDeferRegisterStaticComponent)
		{
			// Defer registration until after UCS has completed.
			FDeferRegisterStaticComponents::Get().DeferStaticComponent(this, NewSceneComp, OriginalMobility);
		}
		else
		{
			// Register component, which will create physics/rendering state, now component is in correct position
			NewActorComp->RegisterComponent();
		}
	}

	return NewActorComp;
}