# ArkUI_ContextCallback


## Overview

Event type.

**Since**: 12

**Related module**: [ArkUI_NativeModule](_ark_u_i___native_module.md)


## Summary


### Member Variables

| Name| Description| 
| -------- | -------- |
| void \* [userData](#userdata) | Custom type. | 
| void(\* [callback](#callback) )(void \*[userData](#userdata)) | Event callback. | 


## Member Variable Description


### callback

```
void(* ArkUI_ContextCallback::callback) (void *userData)
```
**Description**

Event callback.


### userData

```
void* ArkUI_ContextCallback::userData
```
**Description**

Custom type.