HLODOutliner::FDragValidationInfo HLODOutliner::FLODActorDropTarget::ValidateDrop(FDragDropPayload& DraggedObjects) const
{
if (DraggedObjects.StaticMeshActors.IsSet() && DraggedObjects.StaticMeshActors->Num() > 0)
{
if (DraggedObjects.StaticMeshActors->Num() > 0 && DraggedObjects.LODActors->Num() == 0)
{
if (DraggedObjects.bSceneOutliner == false)
{
bool bContaining = false;
// Check if this StaticMesh Actor is not already inside this cluster
for (int32 ActorIndex = 0; ActorIndex < DraggedObjects.StaticMeshActors->Num(); ++ActorIndex)
{
if (LODActor->SubActors.Contains(DraggedObjects.StaticMeshActors.GetValue()[ActorIndex]))
{
bContaining = true;
break;
}
}
if (!bContaining)
{
if (DraggedObjects.StaticMeshActors->Num() > 1)
{
return FDragValidationInfo(EHierarchicalLODActionType::MoveActorToCluster, FHLODOutlinerDragDropOp::ToolTip_MultipleSelection_Compatible, LOCTEXT("MoveMultipleToCluster", "Move Actors to Cluster"));
}
else
{
return FDragValidationInfo(EHierarchicalLODActionType::MoveActorToCluster, FHLODOutlinerDragDropOp::ToolTip_Compatible, LOCTEXT("MoveToCluster", "Move Actor to Cluster"));
}
}
else
{
return FDragValidationInfo(EHierarchicalLODActionType::InvalidAction, FHLODOutlinerDragDropOp::ToolTip_Incompatible, LOCTEXT("AlreadyInCluster", "Cannot Add to Existing cluster"));
}
}
else
{
TArray<AActor*> Actors;
for (auto StaticMeshActor : DraggedObjects.StaticMeshActors.GetValue())
{
Actors.Add(StaticMeshActor.Get());
}
Actors.Add(LODActor.Get());
const bool MultipleActors = DraggedObjects.StaticMeshActors->Num() > 1;
if (FHierarchicalLODUtilities::AreActorsInSamePersistingLevel(Actors))
{
return FDragValidationInfo(EHierarchicalLODActionType::AddActorToCluster,
MultipleActors ? FHLODOutlinerDragDropOp::ToolTip_MultipleSelection_Compatible : FHLODOutlinerDragDropOp::ToolTip_Compatible,
MultipleActors ? LOCTEXT("AddMultipleToCluster", "Add Actors to Cluster") : LOCTEXT("AddToCluster", "Add Actor to Cluster"));
}
else
{
return FDragValidationInfo(EHierarchicalLODActionType::InvalidAction,
MultipleActors ? FHLODOutlinerDragDropOp::ToolTip_MultipleSelection_Incompatible : FHLODOutlinerDragDropOp::ToolTip_Incompatible,
LOCTEXT("NotInSameLODLevel", "Actors are not all in the same persisting level"));
}
}
}
if (DraggedObjects.bSceneOutliner)
{
return FDragValidationInfo(EHierarchicalLODActionType::InvalidAction, FHLODOutlinerDragDropOp::ToolTip_Incompatible, LOCTEXT("AlreadyInHLOD", "Actor is already in one of the Hierarchical LOD clusters"));
}
}
else if (DraggedObjects.LODActors.IsSet() && DraggedObjects.LODActors->Num() > 0)
{
// Only valid if dragging inside the HLOD outliner
if (!DraggedObjects.bSceneOutliner)
{
bool bValidForMerge = true;
bool bValidForChilding = true;
int32 FirstLODLevel = -1;
UObject* LevelOuter = nullptr;
UObject* SubActorOuter = (LODActor->SubActors.Num()) ? LODActor->SubActors[0]->GetOuter() : nullptr;
for (auto Actor : DraggedObjects.LODActors.GetValue())
{
ALODActor* InLODActor = Cast<ALODActor>(Actor.Get());
if (InLODActor)
{
// If dragged onto self or already containing LODActor early out
if (InLODActor == LODActor.Get() || LODActor->SubActors.Contains(InLODActor))
{
bValidForMerge = false;
bValidForChilding = false;
break;
}
// Check in case of multiple selected LODActor items to make sure all of them come from the same LOD level
if (FirstLODLevel == -1)
{
FirstLODLevel = InLODActor->LODLevel;
}
if (InLODActor->LODLevel != LODActor->LODLevel)
{
bValidForMerge = false;
if (InLODActor->LODLevel != FirstLODLevel)
{
bValidForChilding = false;
}
}
// Check if in same level asset
if (LevelOuter == nullptr)
{
LevelOuter = InLODActor->GetOuter();
}
else if (LevelOuter != InLODActor->GetOuter())
{
bValidForMerge = false;
bValidForChilding = false;
}
if (InLODActor->SubActors.Num() && SubActorOuter != InLODActor->SubActors[0]->GetOuter())
{
bValidForChilding = false;
bValidForMerge = false;
}
}
}
if (bValidForMerge)
{
return FDragValidationInfo(EHierarchicalLODActionType::MergeClusters, (DraggedObjects.LODActors->Num() == 1) ? FHLODOutlinerDragDropOp::ToolTip_Compatible : FHLODOutlinerDragDropOp::ToolTip_MultipleSelection_Compatible, LOCTEXT("MergeHLODClusters", "Merge Cluster(s)"));
}
else if (bValidForChilding)
{
return FDragValidationInfo(EHierarchicalLODActionType::ChildCluster, (DraggedObjects.LODActors->Num() == 1) ? FHLODOutlinerDragDropOp::ToolTip_Compatible : FHLODOutlinerDragDropOp::ToolTip_MultipleSelection_Compatible, LOCTEXT("ChildHLODClusters", "Add Child Cluster(s)"));
}
else
{
return FDragValidationInfo(EHierarchicalLODActionType::InvalidAction, FHLODOutlinerDragDropOp::ToolTip_Incompatible, LOCTEXT("InvalidOperation", "Invalid Operation"));
}
}
}
return FDragValidationInfo(EHierarchicalLODActionType::InvalidAction, FHLODOutlinerDragDropOp::ToolTip_Incompatible, LOCTEXT("NotImplemented", "Not implemented"));
}
