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How to get list of blueprint child components at compile time in editor?

Working in a custom C++ component, I'm trying to pull a list of child components when PostEditChangeProperty() is called (when a change is made to the component in the editor). However with my current setup, it always returns 0 child components, even when I know this to be false and have manually added child components myself.

Here is the incorrect code I currently have:

 void UPickupObjectComponent::PostEditChangeProperty(FPropertyChangedEvent & e)
 {
     Super::PostEditChangeProperty(e);
     TArray<USceneComponent*> Meshes;
     GetChildrenComponents(false, Meshes);
     if (Meshes.Num() > 0) {
         UE_LOG(LogTemp, Warning, TEXT("Found %d static meshes"), Meshes.Num());
         for (int i = 0; i < Meshes.Num(); i++) {
             if (Meshes[i]->IsA(UStaticMeshComponent::StaticClass())) {
                 ChildMesh = Cast<UStaticMeshComponent>(Meshes[i]);
             }
         }
     }
 }

If I try to call GetChildrenComponents in the blueprint construction script it works. Is there a different function I need to call in c++ to get it to work in editor?

Product Version: UE 4.16
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asked Dec 18 '17 at 03:27 PM in C++ Programming

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Finlaymcd
3 1 3

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1 answer: sort voted first

Here is the function you need. It will fire for each attached component at compile

PickupObjectComponent.h

 virtual void OnChildAttached(USceneComponent* childComponent) override;
 

PickupObjectComponent.cpp

 void UPickupObjectComponent::OnChildAttached(USceneComponent* ChildComponent)
 {
     Super::OnChildAttached(ChildComponent);
     //Your code here
 }
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answered Feb 14 '18 at 01:58 PM

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carpet200
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avatar image Finlaymcd Feb 27 '18 at 08:10 PM

Thanks very much, I went for a different solution in the end but this will be useful in the future.

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