1# ArkUI_ContextCallback
2
3
4## Overview
5
6Event type.
7
8**Since**: 12
9
10**Related module**: [ArkUI_NativeModule](_ark_u_i___native_module.md)
11
12
13## Summary
14
15
16### Member Variables
17
18| Name| Description|
19| -------- | -------- |
20| void \* [userData](#userdata) | Custom type. |
21| void(\* [callback](#callback) )(void \*[userData](#userdata)) | Event callback. |
22
23
24## Member Variable Description
25
26
27### callback
28
29```
30void(* ArkUI_ContextCallback::callback) (void *userData)
31```
32**Description**
33
34Event callback.
35
36
37### userData
38
39```
40void* ArkUI_ContextCallback::userData
41```
42**Description**
43
44Custom type.
45