void FStreamingLevelModel::OnDrop(const TSharedPtr<FLevelDragDropOp>& Op)
{
TArray<ULevelStreaming*> DropStreamingLevels;
for (auto It = Op->StreamingLevelsToDrop.CreateConstIterator(); It; ++It)
{
if ((*It).IsValid())
{
DropStreamingLevels.AddUnique((*It).Get());
}
}
// Prevent dropping items on itself
if (DropStreamingLevels.Num() && DropStreamingLevels.Find(LevelStreaming.Get()) == INDEX_NONE)
{
UWorld* CurrentWorld = LevelCollectionModel.GetWorld();
auto& WorldStreamingLevels = CurrentWorld->StreamingLevels;
// Remove streaming level objects from a world streaming levels list
for (auto It : DropStreamingLevels)
{
WorldStreamingLevels.Remove(It);
}
// Find a new place where to insert the in a world streaming levels list
// Right after the current level, or at start of the list in case if this is persistent level
int32 InsertIndex = WorldStreamingLevels.Find(LevelStreaming.Get());
if (InsertIndex == INDEX_NONE)
{
InsertIndex = 0;
}
else
{
InsertIndex++;
}
WorldStreamingLevels.Insert(DropStreamingLevels, InsertIndex);
CurrentWorld->MarkPackageDirty();
// Force levels list refresh
LevelCollectionModel.PopulateLevelsList();
}
}
bool EditorDestroyLevel( ULevel* InLevel )
{
check(InLevel);
check(!InLevel->IsPersistentLevel());
InLevel->ReleaseRenderingResources();
GStreamingManager->RemoveLevel( InLevel );
UWorld* World = InLevel->OwningWorld;
World->RemoveLevel(InLevel);
InLevel->ClearLevelComponents();
int32 NumFailedDestroyedAttempts = 0;
bool bDestroyedActor = false;
for(int32 ActorIndex = 0; ActorIndex < InLevel->Actors.Num(); ++ActorIndex)
{
AActor* ActorToRemove = InLevel->Actors[ActorIndex];
if (ActorToRemove)
{
bDestroyedActor = World->EditorDestroyActor(ActorToRemove, false);
// Keep track of how many actors were not destroyed because all actors need to be destroyed
if(!bDestroyedActor)
{
NumFailedDestroyedAttempts++;
}
}
}
if(NumFailedDestroyedAttempts > 0)
{
UE_LOG(LogLevelTools, Log, TEXT("Failed to destroy %d actors after attempting to destroy level!"), NumFailedDestroyedAttempts);
}
InLevel->MarkPendingKill();
InLevel->GetOuter()->ClearFlags(RF_Public|RF_Standalone);
World->MarkPackageDirty();
World->BroadcastLevelsChanged();
return true;
}