[Solved] A way for OnClick to ignore children?

Unity Engine
1

I have a button with a child element that shouldn’t be clickable, but its RectTransform seems to trigger OnClick and PointerEnter on the parent button. Is there a way to disable this behaviour?

2

Replace GetComponents with appropriate variables for fun and profit, but this should do it.

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class UnregisterGraphicFromRaycasting : MonoBehaviour {

    void OnEnable(){
        GraphicRegistry.UnregisterGraphicForCanvas(GetComponent<Canvas>(),GetComponent<Graphic>());
    }
}
1 Like
3

Thanks, it works nicely! I added it to Start() instead because OnEnable doesn’t seem to work for instantiated objects, and added a search for the canvas from the demo DragMe script.

In case anyone else needs this:

using UnityEngine;
using System.Collections;
using UnityEngine.UI;


[RequireComponent(typeof(Graphic))]
public class UnregisterGraphicFromRaycasting : MonoBehaviour {
  
    void Start(){

        Canvas canvas = FindInParents<Canvas>(gameObject); //searching in parents because there can be multiple canvases

        GraphicRegistry.UnregisterGraphicForCanvas(canvas, GetComponent<Graphic>());
    }

    static public T FindInParents<T>(GameObject go) where T : Component
    {
        if (go == null) return null;
        T comp = go.GetComponent<T>();
      
        if (comp != null)
            return comp;
      
        Transform t = go.transform.parent;
        while (t != null && comp == null)
        {
            comp = t.gameObject.GetComponent<T>();
            t = t.parent;
        }
        return comp;
    }
}
4

The other way, as I was looking for something else and loaded up the example project! :

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class IgnoreRaycast : MonoBehaviour, ICanvasRaycastFilter 
{
    public bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
    {
        return false;
    }
}
5

this might be old, but in case anyone wondering, un-check ‘Raycast Target’ component of child in inspector will solve this problem.

3 Likes