What is the correct way to procedurally create components in an Editor Tool

Development Programming & Scripting
1

Hi everyone,

Hopefully this question is simple enough:

I’m trying to create an editor tool for a project that allows for new components to be added on to an actor outside of the construction script.

The actor exists in the level and the user can press a button to add on components to the object in the level. After finished I need to be able to save this object in the level so that those components remain next time I load that level.

I’m trying to work out what the correct method of instantiating those components is, so far I’ve tried:

		AttachedComponent = NewObject<UAttachedComponent>(this);
	AttachedComponent->CreationMethod = EComponentCreationMethod::Native;
	AttachedComponent->OnComponentCreated();
	AttachedComponent->RegisterComponent();
	AttachedComponent->SetupAttachment(RootComponent);
	AttachedComponent->InitialiseComponent();

for a USceneObject called after PostInitializeComponents. However the components don’t appear on the object, and also don’t save as I get this error: Can-t-Save-graph-is-linked-to-private-objects — ImgBB

I’ve tried using CreateDefaultSubobject, which works fine, but only works during the constructor, which isn’t ideal for my use case since I need to be able to add/remove components during the editor.

Any help or advice would be massively appreciated, as I’m hitting a dead end with this.

Thanks,

Tim

2

Hi Tim,

Do you want to add the component to just the individual placed instance of the object or to blueprint of the object?

If it’s the blueprint I have done something like this:

void UElgEditorBP_UBlueprint::BlueprintAddComponent(UBlueprint* Blueprint, TSubclassOf<UActorComponent> ComponentClass)
{
	if (Blueprint == nullptr || ComponentClass == nullptr) return;

#if WITH_EDITOR

	// make sure the blueprint type support components before we continue to add one...
	if (!FBlueprintEditorUtils::DoesSupportComponents(Blueprint)) return;

	USimpleConstructionScript* blueprintSCS = Blueprint->SimpleConstructionScript;

	if (USCS_Node* newCompNode = blueprintSCS->CreateNode(ComponentClass, ComponentClass->GetFName()))
	{
		blueprintSCS->AddNode(newCompNode);
	} else {
		UE_LOG(LogTemp, Warning, TEXT("BlueprintAddComponent:: Failed to create an new component node!"))
	}

#endif

}
1 Like