# multimodalinput\_input
- [Introduction](#section11660541593)
- [Directory Structure](#section14408467105)
- [Usage](#section18111235161011)
- [Available APIs](#section86358081116)
- [Usage Guidelines](#section789634518111)
- [Repositories Involved](#section135327891219)
## Introduction
The module of this repository is applied on the basis of standard systems to provide devices with single-touch input capabilities. This module reports touch events to the JS UI framework or application framework, which then encapsulates the events and provides APIs for apps.
## Directory Structure
```
/foundation/multimodalinput/input
├── common # Common code
├── interfaces # External APIs
│ └── native # Native APIs
│ └── innerkits # Native APIs provided for internal subsystems
├── service # Service framework code
├── sa_profile # Service startup configuration file
├── uinput # Input event injection module
```
## Usage
### Available APIs
Available APIs of Multimodal Input are event injection ones, which are open only to system apps currently.
- The **InJectEventHandler** class provides methods for processing injection events.
**Table 1** Major APIs in InJectEventHandler
Category
API
Description
Event injection
function injectEventSync(keyEvent: KeyEvent): number;
Injects events.
### Usage Guidelines
Currently, only the **BACK** key event can be injected.
When a system app needs to return to the previous directory, you can call the API to inject the **BACK** key event to Multimodal Input, which then transfers this event to the system app, thereby achieving the return effect. The example code is as follows:
```
// Import the required JavaScript API library.
import input from '@ohos.injectEventHandler'
// Call the API for injecting events.
var res = input.injectEventSync({
isPressed:true, // Action type of the key event. true indicates that the key is being pressed down, and false indicates that the key is being released.
code:2, // Keycode for the key, for example, 2 for the BACK key.
keyDownDuration:10, // Duration in which the current key is pressed down before it is released, in milliseconds.
});
```
> **NOTE:**
>The new APIs must be compatible with the original capabilities.
## Repositories Involved
Multimodal input subsystem
**multimodalinput\_input**