[**Kvaser CanKing GUI Extensions SDK v7.5.1**](../../README.md)

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[Kvaser CanKing GUI Extensions SDK](../../modules.md) / [hooks](../README.md) / IUndoObject

# Interface: IUndoObject\<T\>

The undo/redo object. Includes the current state and methods to manipulate it.

## Type Parameters

### T

`T`

The type of the undo/redo data.

## Properties

### canRedo()

> **canRedo**: () => `boolean`

Check if redo is possible

#### Returns

`boolean`

true if there are states to redo to

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### canUndo()

> **canUndo**: () => `boolean`

Check if undo is possible

#### Returns

`boolean`

true if there are states to undo to

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### redo()

> **redo**: () => `void`

Redo to the next state

#### Returns

`void`

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### reset()

> **reset**: (`current?`, `previous?`, `next?`) => `void`

Reset the undo/redo history with a new initial value

#### Parameters

##### current?

`T`

The new initial value. If undefined, current will be unset.

##### previous?

`T`[]

The previous values (optional)

##### next?

`T`[]

The next values (optional)

#### Returns

`void`

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### set()

> **set**: (`updater`) => `void`

Set a new current state

#### Parameters

##### updater

The new value or a function that receives the current value and returns the new value

`T` | (`curr?`) => `T`

#### Returns

`void`

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### state

> **state**: [`IUndoState`](IUndoState.md)\<`T`\>

The current undo/redo state

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### subscribe()?

> `optional` **subscribe**: (`listener`) => () => `void`

Subscribe to state changes (optional, for triggering re-renders)

#### Parameters

##### listener

() => `void`

Callback function that will be called whenever state changes

#### Returns

Unsubscribe function

> (): `void`

##### Returns

`void`

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### undo()

> **undo**: () => `void`

Undo to the previous state

#### Returns

`void`