How can I use Drag handlers (IBeginDragHandler, IEndDragHandler, IDragHandler) with a 2D sprite renderer instead of a UI Image?

Question

In my game, I assigned all of the blocks to be 2D sprites so that they could be easily converted into prefabs:

However, when designing the drag and drop scripts, I noticed that all of the drag and drop handlers such as IBeginDragHandler, IEndDragHandler, IDragHandler, etc. weren't working at all. I later noticed that these were intended to be used by UI Images.

Now I am left wondering what I can do to make these 2D Sprites be usable by these functions for UI Images. Do I have any other options other than to start from scratch by making new UI Images?

Here's the small amount of code needed to create a reproducible example:

Public class DragDrop : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler { [SerializeField] private Canvas canvas; private CanvasGroup canvasGroup; private RectTransform rectTransform; private void Awake() { rectTransform = GetComponent<RectTransform>(); canvasGroup = GetComponent<CanvasGroup>(); } public void OnBeginDrag(PointerEventData eventData) { canvasGroup.alpha = 0.6f; canvasGroup.blocksRaycasts = false; } public void OnDrag(PointerEventData eventData) { rectTransform.anchoredPosition += eventData.delta / canvas.scaleFactor; } public void OnEndDrag(PointerEventData eventData) { canvasGroup.alpha = 1f; canvasGroup.blocksRaycasts = true; } }

Candid Moon _Max_ · Accepted Answer · 2020-07-31 11:08:39Z

Make sure that:

You have a Collider2D(BoxCollider2D etc.) added.
Physics2DRaycaster added to your camera.
EventSystem in your scene.
Nothing is blocking the Raycast to this SpriteRenderer.

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.EventSystems; [RequireComponent(typeof(Collider2D))] public class DraggableSpriteRenderer : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler { [SerializeField] private SpriteRenderer _spriteRenderer; public SpriteRenderer _SpriteRenderer => this._spriteRenderer; public void OnDrag(PointerEventData eventData) { Debug.Log("OnDrag"); Vector3 movement = new Vector3( x: eventData.delta.x * Time.deltaTime, y: eventData.delta.y * Time.deltaTime ); this.transform.localPosition += movement; } public void OnBeginDrag(PointerEventData eventData) { Debug.Log("OnBeginDrag"); } public void OnEndDrag(PointerEventData eventData) { Debug.Log("OnEndDrag"); } #if UNITY_EDITOR private void Reset() { this._spriteRenderer = this.GetComponent<SpriteRenderer>(); } #endif }

@kayrayorulmaz have you tried all of the steps before this? It can be blocked if there are objects in front of it that also receive raycast hit. — Candid Moon _Max_
– Candid Moon _Max_, Commented Jul 31, 2020 at 10:23
I have placed all of the intractable objects on layer 1, which is a layer higher than any other object in the scene. However, the blocks still don't move at all. All of the previous steps have also been taken. — kayra yorulmaz
– kayra yorulmaz, Commented Jul 31, 2020 at 10:32
@kayrayorulmaz do you have SpriteRenderers inside Canvas? I am trying to reproduce this scenario. — Candid Moon _Max_
– Candid Moon _Max_, Commented Jul 31, 2020 at 10:49
@kayrayorulmaz I have tried to recreate it, so there are 3 scenarios. 1. It's just an object with Transform - works fine. 2. It's an object with Transform but inside Canvas - works fine. 3. It's a SpriteRenderer with RectTransform inside Canvas - it doesn't draw anything because Canvas doesn't recognise SpriteRenderer. After adding Image - works fine. I have posted an edit with my code that I have used for testing this. — Candid Moon _Max_
– Candid Moon _Max_, Commented Jul 31, 2020 at 11:04

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