// Copyright Epic Games, Inc. All Rights Reserved.

#include "ScopedTransaction.h"
#include "Framework/Application/SlateApplication.h"
#include "Editor.h"

FScopedTransaction::FScopedTransaction(const FText& SessionName, const bool bShouldActuallyTransact)
{
    Construct(TEXT(""), SessionName, NULL, bShouldActuallyTransact);
}

FScopedTransaction::FScopedTransaction(const TCHAR* TransactionContext, const FText& SessionName, UObject* PrimaryObject, const bool bShouldActuallyTransact)
{
    Construct(TransactionContext, SessionName, PrimaryObject, bShouldActuallyTransact);
}

void FScopedTransaction::Construct(const TCHAR* TransactionContext, const FText& SessionName, UObject* PrimaryObject, const bool bShouldActuallyTransact)
{
    if (bShouldActuallyTransact && GEditor && GEditor->Trans && ensure(!GIsTransacting))
    {
        Index = GEditor->BeginTransaction(TransactionContext, SessionName, PrimaryObject);
        check(IsOutstanding());
    }
    else
    {
        Index = -1;
    }
}

FScopedTransaction::~FScopedTransaction()
{
    if (IsOutstanding())
    {
        GEditor->EndTransaction();
    }
}

/**
 * Cancels the transaction.  Reentrant.
 */
void FScopedTransaction::Cancel()
{
    if (IsOutstanding())
    {
        GEditor->CancelTransaction(Index);
        Index = -1;
    }
}

/**
 * @return	true if the transaction is still outstanding (that is, has not been cancelled).
 */
bool FScopedTransaction::IsOutstanding() const
{
    return Index >= 0;
}