<!--
{
  "availability" : [
    "FxPlug: 3.1.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Professional Video Applications",
  "identifier" : "/documentation/professional_video_applications/FxUndoAPI",
  "metadataVersion" : "0.1.0",
  "role" : "Protocol",
  "symbol" : {
    "kind" : "Protocol",
    "modules" : [
      "Professional Video Applications"
    ],
    "preciseIdentifier" : "c:objc(pl)FxUndoAPI"
  },
  "title" : "FxUndoAPI"
}
-->

# FxUndoAPI

An API that defines the methods that the host app implements to handle plug-in management of the host app’s undo queue.

```
protocol FxUndoAPI
```

## Overview

Note that not all host apps implement this protocol.

## Topics

### Creating Undo Groups

[`startUndoGroup(_:)`](/documentation/professional_video_applications/FxUndoAPI/startUndoGroup(_:))

Begins a new undo group.

[`endUndoGroup()`](/documentation/professional_video_applications/FxUndoAPI/endUndoGroup())

Closes the current undo group.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)