---
title: "MouseButton"
description: "Representation of a mouse button with its associated [ID][buttonId] for the current platform."
type: "class"
---
Class
Common
```kotlin
expect value class MouseButton(val buttonId: Int)
```
Representation of a mouse button with its associated `ID` for the current platform.
## Companion Object
#### Properties
Common
```kotlin
val Primary: MouseButton
```
The primary mouse button. Typically the left mouse button.
Common
```kotlin
val Secondary: MouseButton
```
The secondary mouse button. Typically the right mouse button.
Common
```kotlin
val Tertiary: MouseButton
```
The tertiary mouse button. Typically the middle mouse button.
Android
```kotlin
actual value class MouseButton(val buttonId: Int)
```
## Companion Object
#### Properties
Android
```kotlin
actual val Primary = MouseButton(MotionEvent.BUTTON_PRIMARY)
```
The left mouse button
Android
```kotlin
actual val Secondary = MouseButton(MotionEvent.BUTTON_SECONDARY)
```
The right mouse button
Android
```kotlin
actual val Tertiary = MouseButton(MotionEvent.BUTTON_TERTIARY)
```
The middle mouse button