Dynamically adding child components in Editor

Development Programming & Scripting C++
1

Is it possible to have component, that would dynamically add other components as children?

For example:

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https://forums.unrealengine.com/core/image/gif;base64
​

Adding CustomComponent would add three StaticMeshComponents.

2

Your attached image is not showing. But to add a component in C++ :

in class constructor:


USceneComponent* SceneComp = CreateDefaultSubobject<USceneComponent>(TEXT("SceneComp"));

and dynamically:


UStaticMeshComponent* Mesh = NewObject<UStaticMeshComponent>(this);

if (Mesh)
{
    Mesh->RegisterComponent();
}
3

Thanks for reply. That seems to be working, but if I am not sure how to properly attach components together.

In header file (WallComponent.h) I create property



UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = Test)
UInstancedStaticMeshComponent* _instances;

and in constructor:



auto name = this->GetName();
name += FString("-wall");

_instances = CreateDefaultSubobject<UInstancedStaticMeshComponent>(*name);
_instances->SetupAttachment(this);

After adding component Wall to Actor in editor I can see that InstancedStaticMeshComponent was attached to Actor and I can edit it using blueprints.
BUT in Details window of attached Wall, there is editable property **Instances **(of type InstancedStaticMeshComponent), which seems to be different one than the attached component.

Any idea what might be cause?

I am afraid this might lead to memory leaks.

4

You can’t add UPROPERTY()s during runtime. The UPROPERTY() macro does stuff during compile time that allows it to be visible to blueprints and editor.