---
layout: default-layout
needAutoGenerateSidebar: true
needGenerateH3Content: true
noTitleIndex: true
title: Dynamsoft Document Viewer API Reference - Interface IUndoRedoStateChangedEvent
keywords: Documentation, Dynamsoft Document Viewer, API Reference, Interface IUndoRedoStateChangedEvent
breadcrumbText: Interface IUndoRedoStateChangedEvent
description: Dynamsoft Document Viewer Documentation API Reference Interface IUndoRedoStateChangedEvent Page
---

# IUndoRedoStateChangedEvent

## Syntax

```typescript
export interface IUndoRedoStateChangedEvent {
    undoCount: number;
    redoCount: number;
}
```