Code to make Blueprint_Reparent safer.

Plugins/UEWingman/Source/UEWingman/Private/WingUtils.cpp

@@ -22,6 +22,11 @@
 #include "Misc/Paths.h"
 #include "Misc/PackageName.h"
 
+// Reparent validation
+#include "Engine/LevelScriptActor.h"
+#include "Animation/AnimInstance.h"
+#include "Blueprint/UserWidget.h"
+
 // Animation Blueprint support
 #include "AnimStateNode.h"
 #include "AnimStateTransitionNode.h"
@@ -397,6 +402,47 @@ bool WingUtils::CheckCanRename(UEdGraphNode* Node, const FString &Name)
 	return true;
 }
 
+// ============================================================
+// Reparent validation
+// ============================================================
+
+bool WingUtils::CanReparentBlueprint(UClass* CurrentGenerated, UClass* Proposed)
+{
+	if (!CurrentGenerated || !Proposed) return false;
+
+	UClass* CurrentParent = CurrentGenerated->GetSuperClass();
+	if (!CurrentParent) return false;
+
+	// Don't allow parenting to itself or one of its children
+	if (Proposed->IsChildOf(CurrentGenerated)) return false;
+
+	// Don't allow parenting to an interface
+	if (Proposed->IsChildOf(UInterface::StaticClass())) return false;
+
+	// LevelScriptActor blueprints stay in the LevelScriptActor hierarchy
+	if (CurrentParent->IsChildOf(ALevelScriptActor::StaticClass()))
+		return Proposed->IsChildOf(ALevelScriptActor::StaticClass());
+
+	// Actor blueprints stay in the Actor hierarchy, but not LevelScriptActor
+	if (CurrentParent->IsChildOf(AActor::StaticClass()))
+		return Proposed->IsChildOf(AActor::StaticClass()) &&
+			!Proposed->IsChildOf(ALevelScriptActor::StaticClass());
+
+	// Component blueprints stay in the ActorComponent hierarchy
+	if (CurrentParent->IsChildOf(UActorComponent::StaticClass()))
+		return Proposed->IsChildOf(UActorComponent::StaticClass());
+
+	// Anim blueprints stay in the AnimInstance hierarchy
+	if (CurrentParent->IsChildOf(UAnimInstance::StaticClass()))
+		return Proposed->IsChildOf(UAnimInstance::StaticClass());
+
+	// Widget blueprints stay in the UserWidget hierarchy
+	if (CurrentParent->IsChildOf(UUserWidget::StaticClass()))
+		return Proposed->IsChildOf(UUserWidget::StaticClass());
+
+	return false;
+}
+
 // ============================================================
 // Blueprint helpers
 // ============================================================