How to set "Run Construction Script on Drag" in C++?

[Zhi_Kang_Shao]

Does anyone know how to set an actor class’ construction script to not run while dragging, in C++? The option is available in the editor under Class Settings.

[UnrealEverything]

I’m not sure I fully understand what you’re trying to achieve but if you have access to the actual Blueprint you should be able to access the following member (and change it) as well.

@Engine\Source\Runtime\Engine\Classes\Engine\Blueprint.h Line 322 in UE4.11.0

/**whether or not you want to continuously rerun the construction script for an actor as you drag it in the editor, or only when the drag operation is complete*/
UPROPERTY(EditAnywhere, Category=BlueprintOptions)
uint32 bRunConstructionScriptOnDrag : 1;

If you look at AActor::PostEditMove in Engine\Source\Runtime\Engine\Private\ActorEditor.cpp you’ll see where and how it calls RerunConstructionScripts.

[Zhi_Kang_Shao]

I want to set the value of that “Run Construction Script on Drag” boolean in C++ rather than blueprint, because it is important for performance reasons and I don’t want to have project members memorize that every time they make a blueprint based off my C++ class.

But that was exactly what I was looking for, thanks! Here is what I do now:

ATileDecorator::ATileDecorator()
{
	UBlueprint* Blueprint = Cast<UBlueprint>(GetClass()->ClassGeneratedBy);
	if (Blueprint)
		Blueprint->bRunConstructionScriptOnDrag = false;
}