Restricting the relative location of a scene component in the blueprint editor

Development Programming & Scripting C++
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1

I have a custom scene component which should always be restricted to locations on a grid. I would like to be able to drag the component in the Blueprint Editor viewport, and on release have it snap to the nearest grid location. I tried doing this with:

void UGridCell::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
	Super::PostEditChangeProperty(PropertyChangedEvent);
	
	// Snap to grid
	FVector Loc = GetRelativeLocation();
	FVector New = FVector(FMath::RoundToInt(Loc.X / GRID_SIZE) * GRID_SIZE + (GRID_SIZE * 0.5f), FMath::RoundToInt(Loc.Y / GRID_SIZE) * GRID_SIZE + (GRID_SIZE * 0.5f), 100.0f);
	SetRelativeLocation(New);
	
	MarkRenderStateDirty();
}

But it doesn’t work, I can drag the component to any position (GRID_SIZE is 400). If I manually enter a location, it does snap.

How would I go about auto-snapping (if it’s possible)?