C++ USceneComponent::UpdateComponentToWorld方法代码示例

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;
}

void UChildActorComponent::ApplyComponentInstanceData(FChildActorComponentInstanceData* ChildActorInstanceData, const ECacheApplyPhase CacheApplyPhase)
{
	check(ChildActorInstanceData);

	ChildActorName = ChildActorInstanceData->ChildActorName;
	if (ChildActor)
	{
		// Only rename if it is safe to
		if(ChildActorName != NAME_None)
		{
			const FString ChildActorNameString = ChildActorName.ToString();
			if (ChildActor->Rename(*ChildActorNameString, nullptr, REN_Test))
			{
				ChildActor->Rename(*ChildActorNameString, nullptr, REN_DoNotDirty | (IsLoading() ? REN_ForceNoResetLoaders : REN_None));
			}
		}

		if (ChildActorInstanceData->ComponentInstanceData)
		{
			ChildActorInstanceData->ComponentInstanceData->ApplyToActor(ChildActor, CacheApplyPhase);
		}

		USceneComponent* ChildActorRoot = ChildActor->GetRootComponent();
		if (ChildActorRoot)
		{
			for (const auto& AttachInfo : ChildActorInstanceData->AttachedActors)
			{
				AActor* AttachedActor = AttachInfo.Actor.Get();
				if (AttachedActor)
				{
					USceneComponent* AttachedRootComponent = AttachedActor->GetRootComponent();
					if (AttachedRootComponent)
					{
						AttachedActor->DetachRootComponentFromParent();
						AttachedRootComponent->AttachToComponent(ChildActorRoot, FAttachmentTransformRules::KeepWorldTransform, AttachInfo.SocketName);
						AttachedRootComponent->SetRelativeTransform(AttachInfo.RelativeTransform);
						AttachedRootComponent->UpdateComponentToWorld();
					}
				}
			}
		}
	}
}

void UChildActorComponent::ApplyComponentInstanceData(FChildActorComponentInstanceData* ChildActorInstanceData)
{
    check(ChildActorInstanceData);

    ChildActorName = ChildActorInstanceData->ChildActorName;
    if (ChildActor)
    {
        // Only rename if it is safe to
        if(ChildActorName != NAME_None)
        {
            const FString ChildActorNameString = ChildActorName.ToString();
            if (ChildActor->Rename(*ChildActorNameString, nullptr, REN_Test))
            {
                ChildActor->Rename(*ChildActorNameString, nullptr, REN_DoNotDirty);
            }
        }

        USceneComponent* ChildActorRoot = ChildActor->GetRootComponent();
        if (ChildActorRoot)
        {
            for (const auto& AttachInfo : ChildActorInstanceData->AttachedActors)
            {
                AActor* AttachedActor = AttachInfo.Actor.Get();
                if (AttachedActor)
                {
                    USceneComponent* AttachedRootComponent = AttachedActor->GetRootComponent();
                    if (AttachedRootComponent)
                    {
                        AttachedActor->DetachRootComponentFromParent();
                        AttachedRootComponent->AttachTo(ChildActorRoot, AttachInfo.SocketName, EAttachLocation::KeepWorldPosition);
                        AttachedRootComponent->SetRelativeTransform(AttachInfo.RelativeTransform);
                        AttachedRootComponent->UpdateComponentToWorld();
                    }
                }
            }
        }
    }
}

void FActorReplacementHelper::AttachChildActors(USceneComponent* RootComponent, const TMap<UObject*, UObject*>& OldToNewInstanceMap)
{
	// if we had attached children reattach them now - unless they are already attached
	for (FAttachedActorInfo& Info : PendingChildAttachments)
	{
		// Check for a reinstanced attachment, and redirect to the new instance if found
		AActor* NewAttachedActor = Cast<AActor>(OldToNewInstanceMap.FindRef(Info.AttachedActor));
		if (NewAttachedActor)
		{
			Info.AttachedActor = NewAttachedActor;
		}

		// If this actor is no longer attached to anything, reattach
		if (!Info.AttachedActor->IsPendingKill() && Info.AttachedActor->GetAttachParentActor() == nullptr)
		{
			USceneComponent* ChildRoot = Info.AttachedActor->GetRootComponent();
			if (ChildRoot && ChildRoot->AttachParent != RootComponent)
			{
				ChildRoot->AttachTo(RootComponent, Info.AttachedToSocket, EAttachLocation::KeepWorldPosition);
				ChildRoot->UpdateComponentToWorld();
			}
		}
	}
}

//.........这里部分代码省略.........
				else
				{
					UActorComponent* OuterComponent = Component->GetTypedOuter<UActorComponent>();
					while (OuterComponent)
					{
						if (OuterComponent->IsCreatedByConstructionScript())
						{
							DestroyedComponentsByName.Add(Component->GetFName(), Component);
							break;
						}
						OuterComponent = OuterComponent->GetTypedOuter<UActorComponent>();
					}
				}
			}
		}
#endif

		// Destroy existing components
		DestroyConstructedComponents();

		// Reset random streams
		ResetPropertiesForConstruction();

		// Exchange net roles before running construction scripts
		UWorld *OwningWorld = GetWorld();
		if (OwningWorld && !OwningWorld->IsServer())
		{
			ExchangeNetRoles(true);
		}

		// Run the construction scripts
		ExecuteConstruction(OldTransform, InstanceDataCache);

		if(Parent)
		{
			USceneComponent* ChildRoot = GetRootComponent();
			if (ParentComponent == NULL)
			{
				ParentComponent = Parent->GetRootComponent();
			}
			if (ChildRoot != NULL && ParentComponent != NULL)
			{
				ChildRoot->AttachTo(ParentComponent, SocketName, EAttachLocation::KeepWorldPosition);
			}
		}

		// If we had attached children reattach them now - unless they are already attached
		for(FAttachedActorInfo& Info : AttachedActorInfos)
		{
			// If this actor is no longer attached to anything, reattach
			if (!Info.AttachedActor->IsPendingKill() && Info.AttachedActor->GetAttachParentActor() == NULL)
			{
				USceneComponent* ChildRoot = Info.AttachedActor->GetRootComponent();
				if (ChildRoot && ChildRoot->AttachParent != RootComponent)
				{
					ChildRoot->AttachTo(RootComponent, Info.AttachedToSocket, EAttachLocation::KeepWorldPosition);
					if (Info.bSetRelativeTransform)
					{
						ChildRoot->SetRelativeTransform(Info.RelativeTransform);
					}
					ChildRoot->UpdateComponentToWorld();
				}
			}
		}

		// Restore the undo buffer
		GUndo = CurrentTransaction;

#if WITH_EDITOR
		// Create the mapping of old->new components and notify the editor of the replacements
		TMap<UObject*, UObject*> OldToNewComponentMapping;

		TInlineComponentArray<UActorComponent*> NewComponents;
		GetComponents(NewComponents);
		for (auto NewComp : NewComponents)
		{
			const FName NewCompName = NewComp->GetFName();
			if (DestroyedComponentsByName.Contains(NewCompName))
			{
				OldToNewComponentMapping.Add(DestroyedComponentsByName[NewCompName], NewComp);
			}
		}

		if (GEditor && (OldToNewComponentMapping.Num() > 0))
		{
			GEditor->NotifyToolsOfObjectReplacement(OldToNewComponentMapping);
		}

		if (ActorTransactionAnnotation)
		{
			CurrentTransactionAnnotation = NULL;
		}
		else
#endif
		{
			delete InstanceDataCache;
		}

	}
}

//.........这里部分代码省略.........
		
		// Create cache to store component data across rerunning construction scripts
		FComponentInstanceDataCache InstanceDataCache(this);

		// If there are attached objects detach them and store the socket names
		TArray<AActor*> AttachedActors;
		GetAttachedActors(AttachedActors);

		// Struct to store info about attached actors
		struct FAttachedActorInfo
		{
			AActor* AttachedActor;
			FName AttachedToSocket;
		};

		// Save info about attached actors
		TArray<FAttachedActorInfo> AttachedActorInfos;
		for( AActor* AttachedActor : AttachedActors)
		{
			USceneComponent* EachRoot = AttachedActor->GetRootComponent();
			// If the component we are attached to is about to go away...
			if( EachRoot && EachRoot->AttachParent && EachRoot->AttachParent->bCreatedByConstructionScript )
			{
				// Save info about actor to reattach
				FAttachedActorInfo Info;
				Info.AttachedActor = AttachedActor;
				Info.AttachedToSocket = EachRoot->AttachSocketName;
				AttachedActorInfos.Add(Info);

				// Now detach it
				AttachedActor->Modify();
				EachRoot->DetachFromParent(true);					
			}
		}

		// Save off original pose of the actor
		FTransform OldTransform = FTransform::Identity;
		FName  SocketName;
		AActor* Parent = NULL;
		if (RootComponent != NULL)
		{
			// Do not need to detach if root component is not going away
			if(RootComponent->AttachParent != NULL && RootComponent->bCreatedByConstructionScript)
			{
				Parent = RootComponent->AttachParent->GetOwner();
				// Root component should never be attached to another component in the same actor!
				if(Parent == this)
				{
					UE_LOG(LogActor, Warning, TEXT("RerunConstructionScripts: RootComponent (%s) attached to another component in this Actor (%s)."), *RootComponent->GetPathName(), *Parent->GetPathName());
					Parent = NULL;
				}

				SocketName = RootComponent->AttachSocketName;
				//detach it to remove any scaling 
				RootComponent->DetachFromParent(true);
			}
			OldTransform = RootComponent->ComponentToWorld;
		}

		// Destroy existing components
		DestroyConstructedComponents();

		// Reset random streams
		ResetPropertiesForConstruction();

		// Run the construction scripts
		OnConstruction(OldTransform);

		if(Parent)
		{
			USceneComponent* ChildRoot =	GetRootComponent();
			USceneComponent* ParentRoot =	Parent->GetRootComponent();
			if(ChildRoot != NULL && ParentRoot != NULL)
			{
				ChildRoot->AttachTo( ParentRoot, SocketName, EAttachLocation::KeepWorldPosition );
			}
		}

		// Apply per-instance data.
		InstanceDataCache.ApplyToActor(this);

		// If we had attached children reattach them now - unless they are already attached
		for(FAttachedActorInfo& Info : AttachedActorInfos)
		{
			// If this actor is no longer attached to anything, reattach
			if (Info.AttachedActor->GetAttachParentActor() == NULL)
			{
				USceneComponent* ChildRoot = Info.AttachedActor->GetRootComponent();
				if (ChildRoot && ChildRoot->AttachParent != RootComponent)
				{
					ChildRoot->AttachTo(RootComponent, Info.AttachedToSocket, EAttachLocation::KeepWorldPosition);
					ChildRoot->UpdateComponentToWorld();
				}
			}
		}

		// Restore the undo buffer
		GUndo = CurrentTransaction;
	}
}