コード例 #1
0
/**
 * Enacts the transaction.
 */
void FTransaction::Apply()
{
	checkSlow(Inc==1||Inc==-1);

	// Figure out direction.
	const int32 Start = Inc==1 ? 0             : Records.Num()-1;
	const int32 End   = Inc==1 ? Records.Num() :              -1;

	// Init objects.
	TMap<UObject*, TSharedPtr<ITransactionObjectAnnotation>> ChangedObjects;
	for( int32 i=Start; i!=End; i+=Inc )
	{
		FObjectRecord& Record = Records[i];
		Record.bRestored = false;

		UObject* Object = Record.Object.Get();
		if (!ChangedObjects.Contains(Object))
		{
			Object->CheckDefaultSubobjects();
			Object->PreEditUndo();
		}

		ChangedObjects.Add(Object, Record.ObjectAnnotation);
	}
	for( int32 i=Start; i!=End; i+=Inc )
	{
		Records[i].Restore( this );
	}

	// An Actor's components must always get its PostEditUndo before the owning Actor so do a quick sort
	ChangedObjects.KeySort([](UObject& A, UObject& B)
	{
		UActorComponent* BAsComponent = Cast<UActorComponent>(&B);
		return (BAsComponent ? (BAsComponent->GetOwner() != &A) : true);
	});

	NumModelsModified = 0;		// Count the number of UModels that were changed.
	for (auto ChangedObjectIt : ChangedObjects)
	{
		UObject* ChangedObject = ChangedObjectIt.Key;
		UModel* Model = Cast<UModel>(ChangedObject);
		if (Model && Model->Nodes.Num())
		{
			FBSPOps::bspBuildBounds(Model);
			++NumModelsModified;
		}
		TSharedPtr<ITransactionObjectAnnotation> ChangedObjectTransactionAnnotation = ChangedObjectIt.Value;
		if (ChangedObjectTransactionAnnotation.IsValid())
		{
			ChangedObject->PostEditUndo(ChangedObjectTransactionAnnotation);
		}
		else
		{
			ChangedObject->PostEditUndo();
		}
	}

	// Flip it.
	if (bFlip)
	{
		Inc *= -1;
	}
	for (auto ChangedObjectIt : ChangedObjects)
	{
		UObject* ChangedObject = ChangedObjectIt.Key;
		ChangedObject->CheckDefaultSubobjects();
	}
}