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Event.button

public int button;

Description

Which mouse button was pressed.

0 means left mouse button, 1 means right mouse button, 2 means middle mouse button. Used in EventType.MouseDown and EventType.MouseUp events.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void OnGUI() { Event e = Event.current; if (e.button == 0 && e.isMouse) Debug.Log("Left Click"); else if (e.button == 1) Debug.Log("Right Click"); else if (e.button == 2) Debug.Log("Middle Click"); else if (e.button > 2) Debug.Log("Another button in the mouse clicked"); } }