Loading Blueprint from C++, path issues

Development Programming & Scripting
,
7

Here’s a templated version of loading a blueprint from C++. Used only for loading HUD blueprints, so in this case it is in our AHUD class .h file.

Example of use:

_toolbarHudWidget = LoadHUDWidget<UPrimaryToolbarHUDWidget>(GetWorld(), "/Game/Blueprints/HUD/PrimaryToolbar.PrimaryToolbar_C"); // append _C

Code must be in .h file since it is a template function.

template<typename T = UUserWidget, typename Owner = UObject>
static T* LoadHUDWidget(Owner owningObject, FString widgetName)
{
	// load the HUD bluprint and add to viewport
	FSoftClassPath HUDClassReference(widgetName); // must append "_C"!!!
	UClass* HUDClass = HUDClassReference.TryLoadClass<UUserWidget>();
	if (HUDClass != nullptr)
	{
		// load the blueprint and add it to the viewport
		UUserWidget* tempWidget = CreateWidget<UUserWidget>(owningObject, HUDClass);
		T* UserWidgetClass = Cast<T>(tempWidget);
		if (UserWidgetClass != nullptr)
		{
			UserWidgetClass->AddToViewport();
			return UserWidgetClass;
		}
		else
		{
			LOG("BaseHUD::LoadHUDWidget() - failed for '%s'!", *widgetName);
			return nullptr;
		}
	}
	else 
	{
		LOG("BaseHUD::LoadHUDWidget() - failed for '%s'!", *widgetName);
		return nullptr;
	}
}