C++ TInlineComponentArray::Sort方法代码示例

//* Destroys the constructed components.
void AActor::DestroyConstructedComponents()
{
	// Remove all existing components
	TInlineComponentArray<UActorComponent*> PreviouslyAttachedComponents;
	GetComponents(PreviouslyAttachedComponents);

	// We need the hierarchy to be torn down in attachment order, so do a quick sort
	PreviouslyAttachedComponents.Remove(nullptr);
	PreviouslyAttachedComponents.Sort([](UActorComponent& A, UActorComponent& B)
	{
		if (USceneComponent* BSC = Cast<USceneComponent>(&B))
		{
			if (BSC->AttachParent == &A)
			{
				return false;
			}
		}
		return true;
	});

	for (UActorComponent* Component : PreviouslyAttachedComponents)
	{
		if (Component)
		{
			bool bDestroyComponent = false;
			if (Component->IsCreatedByConstructionScript())
			{
				bDestroyComponent = true;
			}
			else
			{
				UActorComponent* OuterComponent = Component->GetTypedOuter<UActorComponent>();
				while (OuterComponent)
				{
					if (OuterComponent->IsCreatedByConstructionScript())
					{
						bDestroyComponent = true;
						break;
					}
					OuterComponent = OuterComponent->GetTypedOuter<UActorComponent>();
				}
			}

			if (bDestroyComponent)
			{
				if (Component == RootComponent)
				{
					RootComponent = NULL;
				}

				Component->DestroyComponent();

				// Rename component to avoid naming conflicts in the case where we rerun the SCS and name the new components the same way.
				FName const NewBaseName( *(FString::Printf(TEXT("TRASH_%s"), *Component->GetClass()->GetName())) );
				FName const NewObjectName = MakeUniqueObjectName(this, GetClass(), NewBaseName);
				Component->Rename(*NewObjectName.ToString(), this, REN_ForceNoResetLoaders|REN_DontCreateRedirectors|REN_NonTransactional);
			}
		}
	}
}

void UActorRecording::ProcessNewComponentArray(TInlineComponentArray<USceneComponent*>& ProspectiveComponents) const
{
	// Only iterate as far as the current size of the array (it may grow inside the loop)
	int32 LastIndex = ProspectiveComponents.Num();
	for(int32 Index = 0; Index < LastIndex; ++Index)
	{
		USceneComponent* NewComponent = ProspectiveComponents[Index];

		USceneComponent* Parent = ProspectiveComponents[Index]->GetAttachParent();

		while (Parent)
		{
			TWeakObjectPtr<USceneComponent> WeakParent(Parent);
			if (TrackedComponents.Contains(WeakParent) || ProspectiveComponents.Contains(Parent) || Parent->GetOwner() != NewComponent->GetOwner())
			{
				break;
			}
			else
			{
				ProspectiveComponents.Add(Parent);
			}

			Parent = Parent->GetAttachParent();
		}
	}

	// Sort parent first, to ensure that attachments get added properly
	TMap<USceneComponent*, int32> AttachmentDepths;
	for (USceneComponent* Component : ProspectiveComponents)
	{
		AttachmentDepths.Add(Component, GetAttachmentDepth(Component));
	}

	ProspectiveComponents.Sort(
		[&](USceneComponent& A, USceneComponent& B)
		{
			return *AttachmentDepths.Find(&A) < *AttachmentDepths.Find(&B);
		}
	);
}

void AActor::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
	UProperty* PropertyThatChanged = PropertyChangedEvent.Property;
	FName PropertyName = PropertyThatChanged != NULL ? PropertyThatChanged->GetFName() : NAME_None;
	
	const bool bTransformationChanged = (PropertyName == Name_RelativeLocation || PropertyName == Name_RelativeRotation || PropertyName == Name_RelativeScale3D);

	// During SIE, allow components to reregistered and reconstructed in PostEditChangeProperty.
	// This is essential as construction is deferred during spawning / duplication when in SIE.
	if ((GEditor && GEditor->bIsSimulatingInEditor) || ReregisterComponentsWhenModified())
	{
		// In the Undo case we have an annotation storing information about constructed components and we do not want
		// to improperly apply out of date changes so we need to skip registration of all blueprint created components
		// and defer instance components attached to them until after rerun
		if (CurrentTransactionAnnotation.IsValid())
		{
			UnregisterAllComponents();

			TInlineComponentArray<UActorComponent*> Components;
			GetComponents(Components);

			Components.Sort([](UActorComponent& A, UActorComponent& B)
			{
				if (&B == B.GetOwner()->GetRootComponent())
				{
					return false;
				}
				if (USceneComponent* ASC = Cast<USceneComponent>(&A))
				{
					if (ASC->GetAttachParent() == &B)
					{
						return false;
					}
				}
				return true;
			});

			bool bRequiresReregister = false;
			for (UActorComponent* Component : Components)
			{
				if (Component->CreationMethod == EComponentCreationMethod::Native)
				{
					Component->RegisterComponent();
				}
				else if (Component->CreationMethod == EComponentCreationMethod::Instance)
				{
					USceneComponent* SC = Cast<USceneComponent>(Component);
					if (SC == nullptr || SC == RootComponent || (SC->GetAttachParent() && SC->GetAttachParent()->IsRegistered()))
					{
						Component->RegisterComponent();
					}
					else
					{
						bRequiresReregister = true;
					}
				}
				else
				{
					bRequiresReregister = true;
				}
			}

			RerunConstructionScripts();

			if (bRequiresReregister)
			{
				ReregisterAllComponents();
			}
		}
		else
		{
			UnregisterAllComponents();
			RerunConstructionScripts();
			ReregisterAllComponents();
		}
	}

	// Let other systems know that an actor was moved
	if (bTransformationChanged)
	{
		GEngine->BroadcastOnActorMoved( this );
	}

	if (GetWorld())
	{
		GetWorld()->bDoDelayedUpdateCullDistanceVolumes = true;
	}

	FEditorSupportDelegates::UpdateUI.Broadcast();
	Super::PostEditChangeProperty(PropertyChangedEvent);
}

void USimpleConstructionScript::ExecuteScriptOnActor(AActor* Actor, const FTransform& RootTransform, bool bIsDefaultTransform)
{
	if(RootNodes.Num() > 0)
	{
		TSet<UActorComponent*> AllComponentsCreatedBySCS;
		TInlineComponentArray<UActorComponent*> InstancedComponents;
		for(auto NodeIt = RootNodes.CreateIterator(); NodeIt; ++NodeIt)
		{
			USCS_Node* RootNode = *NodeIt;
			if(RootNode != nullptr)
			{
				// Get all native scene components
				TInlineComponentArray<USceneComponent*> Components;
				Actor->GetComponents(Components);
				for (int32 Index = Components.Num()-1; Index >= 0; --Index)
				{
					USceneComponent* SceneComponent = Components[Index];
					if (SceneComponent->CreationMethod == EComponentCreationMethod::Instance)
					{
						Components.RemoveAt(Index);
					}
					else
					{
						// Handle the native sub-component of an instance component case
						USceneComponent* ParentSceneComponent = SceneComponent->GetTypedOuter<USceneComponent>();
						if (ParentSceneComponent && ParentSceneComponent->CreationMethod == EComponentCreationMethod::Instance)
						{
							Components.RemoveAt(Index);
						}
					}
				}

				// Get the native root component; if it's not set, the first native scene component will be used as root. This matches what's done in the SCS editor.
				USceneComponent* RootComponent = Actor->GetRootComponent();
				if(RootComponent == nullptr && Components.Num() > 0)
				{
					RootComponent = Components[0];
				}

				// If the root node specifies that it has a parent
				USceneComponent* ParentComponent = nullptr;
				if(RootNode->ParentComponentOrVariableName != NAME_None)
				{
					// Get the Actor class object
					UClass* ActorClass = Actor->GetClass();
					check(ActorClass != nullptr);

					// If the root node is parented to a "native" component (i.e. in the 'Components' array)
					if(RootNode->bIsParentComponentNative)
					{
						for(int32 CompIndex = 0; CompIndex < Components.Num(); ++CompIndex)
						{
							// If we found a match, remember the index
							if(Components[CompIndex]->GetFName() == RootNode->ParentComponentOrVariableName)
							{
								ParentComponent = Components[CompIndex];
								break;
							}
						}
					}
					else
					{
						// In the non-native case, the SCS node's variable name property is used as the parent identifier
						UObjectPropertyBase* Property = FindField<UObjectPropertyBase>(ActorClass, RootNode->ParentComponentOrVariableName);
						if(Property != nullptr)
						{
							// If we found a matching property, grab its value and use that as the parent for this node
							ParentComponent = Cast<USceneComponent>(Property->GetObjectPropertyValue_InContainer(Actor));
						}
					}
				}

				// Create the new component instance and any child components it may have
				UActorComponent* InstancedComponent = RootNode->ExecuteNodeOnActor(Actor, ParentComponent != nullptr ? ParentComponent : RootComponent, &RootTransform, bIsDefaultTransform);
				if(InstancedComponent != nullptr)
				{
					InstancedComponents.Add(InstancedComponent);
				}

				// get list of every component SCS created, in case some of them aren't in the attachment hierarchy any more (e.g. rigid bodies)
				TInlineComponentArray<USceneComponent*> ComponentsAfterSCS;
				Actor->GetComponents(ComponentsAfterSCS);
				for (USceneComponent* C : ComponentsAfterSCS)
				{
					if (Components.Contains(C) == false)
					{
						AllComponentsCreatedBySCS.Add(C);
					}
				}
			}
		}

		// Register all instanced SCS components once SCS execution has finished; sorted in order to register the scene component hierarchy first, followed by the remaining actor components (in case they happen to depend on something in the scene hierarchy)
		InstancedComponents.Sort([](const UActorComponent& A, const UActorComponent& B) { return A.IsA<USceneComponent>(); });
		for(auto InstancedComponent : InstancedComponents)
		{
			RegisterInstancedComponent(InstancedComponent);
		}

		// now that the instanced components in the attachment hierarchy are registered, register any other components that SCS made but aren't in the attachment hierarchy for whatever reason.
//.........这里部分代码省略.........