UKismetSystemLibrary::CancelTransaction

function Engine Blueprint Since unknown

#include "Kismet/KismetSystemLibrary.h"

Access: public Specifiers: staticBlueprintCallable

Description

Cancels the current transaction and stops capturing actions into the undo buffer. Editor-only.

Caveats & Gotchas

• You must pass the exact Index value returned by the matching BeginTransaction call — passing the wrong index can cancel more or less of the undo history than intended.
• Cancelling does not undo actions already performed since BeginTransaction; it only stops further recording and discards the pending transaction entry.
• Only available in the editor.

Signature

static void CancelTransaction(const int32 Index)

Parameters

Name	Type	Description	Default
Index	int32	The action counter to cancel transactions from, as returned by BeginTransaction.	—

Return Type

void

Example

Abort a transaction if a scripted edit fails partway through C++

int32 TransactionIndex = UKismetSystemLibrary::BeginTransaction(TEXT("MyEditorTool"), FText::FromString(TEXT("Batch Edit")), nullptr);
if (!TryApplyEdits())
{
    UKismetSystemLibrary::CancelTransaction(TransactionIndex);
}
else
{
    UKismetSystemLibrary::EndTransaction();
}

Version History

Introduced in: unknown

Version	Status	Notes
5.6	stable	—

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