83 lines
2.1 KiB
C#
83 lines
2.1 KiB
C#
using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.UI;
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public class DraggableUI : MonoBehaviour, IDragHandler, IPointerDownHandler
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{
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public RectTransform target;
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public Button button;
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private bool isLocked = false;
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private Vector3 _dragOffset;
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private float _dragScreenZ;
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private void Awake()
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{
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LockDrag();
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}
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public void OnPointerDown(PointerEventData eventData)
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{
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if (isLocked) return;
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Camera cam = ResolveCamera(eventData);
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if (cam == null) return;
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// 记录指针与物体的世界空间偏移，避免拖动开始时物体跳到指针中心。
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_dragScreenZ = cam.WorldToScreenPoint(transform.position).z;
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Vector3 pointerWorld = ScreenToWorld(cam, eventData.position, _dragScreenZ);
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_dragOffset = transform.position - pointerWorld;
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}
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public void OnDrag(PointerEventData eventData)
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{
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if (isLocked) return;
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Camera cam = ResolveCamera(eventData);
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if (cam == null) return;
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Vector3 pointerWorld = ScreenToWorld(cam, eventData.position, _dragScreenZ);
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Vector3 move = pointerWorld + _dragOffset;
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move.z = transform.position.z;
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transform.position = move;
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}
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void Update()
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{
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if (target == null || button == null) return;
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float distance = Vector3.Distance(transform.position, target.position);
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if (distance <= 1 && !isLocked)
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{
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button.interactable=true;
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}
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else
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{
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button.interactable=false;
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}
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}
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public void LockDrag()
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{
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isLocked = true;
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}
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public void UnlockDrag()
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{
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isLocked = false;
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}
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private static Camera ResolveCamera(PointerEventData eventData)
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{
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if (eventData != null && eventData.pressEventCamera != null)
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return eventData.pressEventCamera;
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return Camera.main;
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}
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private static Vector3 ScreenToWorld(Camera cam, Vector2 screenPosition, float screenZ)
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{
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return cam.ScreenToWorldPoint(new Vector3(screenPosition.x, screenPosition.y, screenZ));
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}
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}
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