FComponentVisualizer::FPropertyNameAndIndex FComponentVisualizer::GetComponentPropertyName(const UActorComponent* Component)
{
if (Component)
{
const AActor* CompOwner = Component->GetOwner();
if (CompOwner)
{
// Iterate over UObject* fields of this actor
UClass* ActorClass = CompOwner->GetClass();
for (TFieldIterator<UObjectProperty> It(ActorClass); It; ++It)
{
// See if this property points to the component in question
UObjectProperty* ObjectProp = *It;
for (int32 Index = 0; Index < ObjectProp->ArrayDim; ++Index)
{
UObject* Object = ObjectProp->GetObjectPropertyValue(ObjectProp->ContainerPtrToValuePtr<void>(CompOwner, Index));
if (Object == Component)
{
// It does! Return this name
return FPropertyNameAndIndex(ObjectProp->GetFName(), Index);
}
}
}
// If nothing found, look in TArray<UObject*> fields
for (TFieldIterator<UArrayProperty> It(ActorClass); It; ++It)
{
UArrayProperty* ArrayProp = *It;
if (UObjectProperty* InnerProp = Cast<UObjectProperty>(It->Inner))
{
FScriptArrayHelper ArrayHelper(ArrayProp, ArrayProp->ContainerPtrToValuePtr<void>(CompOwner));
for (int32 Index = 0; Index < ArrayHelper.Num(); ++Index)
{
UObject* Object = InnerProp->GetObjectPropertyValue(ArrayHelper.GetRawPtr(Index));
if (Object == Component)
{
return FPropertyNameAndIndex(ArrayProp->GetFName(), Index);
}
}
}
}
}
}
// Didn't find actor property referencing this component
return FPropertyNameAndIndex();
}
FName FComponentEditorUtils::FindVariableNameGivenComponentInstance(UActorComponent* ComponentInstance)
{
check(ComponentInstance != nullptr);
// First see if the name just works
if (AActor* OwnerActor = ComponentInstance->GetOwner())
{
UClass* OwnerActorClass = OwnerActor->GetClass();
if (UObjectProperty* TestProperty = FindField<UObjectProperty>(OwnerActorClass, ComponentInstance->GetFName()))
{
if (ComponentInstance->GetClass()->IsChildOf(TestProperty->PropertyClass))
{
return TestProperty->GetFName();
}
}
}
// Name mismatch, try finding a differently named variable pointing to the the component (the mismatch should only be possible for native components)
if (UActorComponent* Archetype = Cast<UActorComponent>(ComponentInstance->GetArchetype()))
{
if (AActor* OwnerActor = Archetype->GetOwner())
{
UClass* OwnerClass = OwnerActor->GetClass();
AActor* OwnerCDO = CastChecked<AActor>(OwnerClass->GetDefaultObject());
check(OwnerCDO->HasAnyFlags(RF_ClassDefaultObject));
for (TFieldIterator<UObjectProperty> PropIt(OwnerClass, EFieldIteratorFlags::IncludeSuper); PropIt; ++PropIt)
{
UObjectProperty* TestProperty = *PropIt;
if (Archetype->GetClass()->IsChildOf(TestProperty->PropertyClass))
{
void* TestPropertyInstanceAddress = TestProperty->ContainerPtrToValuePtr<void>(OwnerCDO);
UObject* ObjectPointedToByProperty = TestProperty->GetObjectPropertyValue(TestPropertyInstanceAddress);
if (ObjectPointedToByProperty == Archetype)
{
// This property points to the component archetype, so it's an anchor even if it was named wrong
return TestProperty->GetFName();
}
}
}
}
}
return NAME_None;
}