Can't get object to respond to right-click

Question

So I'm trying to do this thing where if I left click on an object, 1 is added to a variable, and if I right click on it, 1 is subtracted from that variable. The left click works fine, but when I right click, nothing is happening.

 public class cs_SliderClick : MonoBehaviour 
 {

     public int sliderValue;

     void Start () 
     {

     }

     void Update () 
     {

     }

     public void OnMouseDown()
     {
         if (Input.GetMouseButtonDown(0))
         {
             sliderValue += 1;
         }

         if (Input.GetMouseButtonDown(1))
         {
             sliderValue -= 1;
         }
     }
 }

Can anyone tell me what I'm doing wrong here?

Thanks.

Answer 1

So I would recommend to call the OnMouseDown() Function inside of the Update Method.

public class cs_SliderClick : MonoBehaviour {

     public int sliderValue;

     void Start () 
     {

     }

     void Update () 
     {
         OnMouseDown();
     }

     public void OnMouseDown()
     {
         if (Input.GetMouseButtonDown(0))
         {
             sliderValue += 1;
         }

         if (Input.GetMouseButtonDown(1))
         {
             sliderValue -= 1;
         }
     }
 }

Answer 2

You need to use Unity's EventSystems.

Implement IPointerClickHandler and then override the OnPointerClick function.

Attach PhysicsRaycaster to the camera if the GameObject is a 3D Mesh. If this is a 2D game then attach Physics2DRaycaster to the camera.

Below is your fixed code:

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

public class cs_SliderClick : MonoBehaviour, IPointerClickHandler
{
    public int sliderValue;

    void Start()
    {
        //Attach PhysicsRaycaster to the Camera. Replace this with Physics2DRaycaster if the GameObject is a 2D Object/sprite
        Camera.main.gameObject.AddComponent<PhysicsRaycaster>();
        addEventSystem();
    }

    public void OnPointerClick(PointerEventData eventData)
    {
        if (eventData.button == PointerEventData.InputButton.Left)
        {
            Debug.Log("Left click");
            sliderValue += 1;
        }

        else if (eventData.button == PointerEventData.InputButton.Right)
        {
            Debug.Log("Right click");
            sliderValue -= 1;
        }
    }


    //Add Event System to the Camera
    void addEventSystem()
    {
        GameObject eventSystem = null;
        GameObject tempObj = GameObject.Find("EventSystem");
        if (tempObj == null)
        {
            eventSystem = new GameObject("EventSystem");
            eventSystem.AddComponent<EventSystem>();
            eventSystem.AddComponent<StandaloneInputModule>();
        }
        else
        {
            if ((tempObj.GetComponent<EventSystem>()) == null)
            {
                tempObj.AddComponent<EventSystem>();
            }

            if ((tempObj.GetComponent<StandaloneInputModule>()) == null)
            {
                tempObj.AddComponent<StandaloneInputModule>();
            }
        }
    }

}