56 lines
1.5 KiB
C#
56 lines
1.5 KiB
C#
using Unity.VisualScripting;
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using UnityEngine;
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using UnityEngine.EventSystems;
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public class UIDragSpawner : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
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{
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public RectTransform rectTransform;
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public GameObject prefabToSpawn;
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public LayerMask mask;
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private GameObject dragPreview;
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private CanvasGroup canvasGroup;
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void Awake()
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{
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canvasGroup = gameObject.GetOrAddComponent<CanvasGroup>();
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}
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public void OnBeginDrag(PointerEventData eventData)
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{
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if (canvasGroup == null)
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canvasGroup = gameObject.AddComponent<CanvasGroup>();
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canvasGroup.alpha = 0.6f;
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canvasGroup.blocksRaycasts = false;
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dragPreview = Instantiate(prefabToSpawn);
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}
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public void OnDrag(PointerEventData eventData)
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{
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if (dragPreview)
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{
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Ray ray = Camera.main.ScreenPointToRay(eventData.position);
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if (Physics.Raycast(ray, out RaycastHit hit, 100.0f, mask))
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{
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dragPreview.transform.position = hit.point;
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}
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}
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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canvasGroup.alpha = 1f;
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canvasGroup.blocksRaycasts = true;
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if (IsPointerOverScrollRect(rectTransform))
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{
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Destroy(dragPreview);
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dragPreview = null;
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}
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}
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public bool IsPointerOverScrollRect(RectTransform rt)
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{
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return RectTransformUtility.RectangleContainsScreenPoint(rt, Input.mousePosition);
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}
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}
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